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DOLD Load monitoring VARIMETER

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DOLD Load monitoring VARIMETER
DOLD can provide you with customer solutions for the monitoring of electrical loads (current, cos φ, effective power). The product portfolio includes current relays, under -load, load and overload monitoring as well as load converters. The devices are used for the monitoring of motors as well as for the function monitoring of electricity consumers.
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Type Function 1-/3- phasig Measuring range, max. Output contacts max. Operate delay Auxiliary voltage required Housing style: Width [mm]
MK 9397N Motor load monitor 3 12 A (8kW) 1 C/O + + Switch cabinet: 22,5
MH 9397 Motor load monitor 3 12 A (8kW) 2 x C/O + (+) Switch cabinet: 45
BH 9097 Motor load monitor 1; 3 40 A (37kW) 2 x C/O + (+) Switch cabinet: 45
BH 9098 Motor load transmitter 1; 3 40 A (37kW) 0...20mA; 0...10V 4...20mA; 2...10V + (+) Switch cabinet: 45
BA 9065 Underlaod monitor (cos j monitor) 1; 3 10 A 1 C/O / 1 C/O; 1 NO + (+) Switch cabinet: 45
MK 9065 Underlaod monitor (cos j monitor) 1; 3 10 A 1 C/O / 1 C/O; 1 NO +
Switch cabinet: 22,5
IK 9065,
SK 9065
Underlaod monitor (cos j monitor) 1; 3 8 A 1 C/O +
Switch cabinet: 17,5 Distribution board: 17.5
SL 9065CT Underlaod monitor (cos j monitor) 1; 3 100 A 2x 1 C/O +
Switch cabinet: 35 Distribution board: 35
BH 9140 Reverse power monitoring 1; 3 40 A 2 C/O + + Switch cabinet: 45
RP 9140 Reverse power monitoring 1; 3 5 A 2 C/O + + Distribution board: 70
NO = normally open contact, C/O = change-over contact
Following product are also available : BA 9067

DOLD Multifunktional relays VARIMETER PRO
DOLD Multifunktional relays VARIMETER PRO
The multifunctional measuring relays that make up the DOLD VARIMETER PRO series offer a wide range of functionality with a minimal width. These universal devices can be installed in a space-saving manner in control cabinets and are cost-effective due to their flexible usage. With a reliable and continuous monitoring of three phase networks, the multifunctional measuring relays guarantee a trouble-free and thus efficient operation of machines and systems. Their use is also rewarding in single phase networks. The user-friendly device configuration allows an optimal adaptation to the application.
order
Type Function 1-/3- phase Standard measuring range Measuring range max. Contacts adjustable operate delay Auxiliary voltage required Housing Style: Width [mm]
MK 9300N,
MH 9300
Multifunktional measuring relay 1; 3 3 AC 24...690 V ...690 V 1 C/O;  2x1 C/O + + Switch cabinet: 22,5; 45
BD 9080 Phase monitor with detection of under-/overvoltages, unbalance, phase failure, phase sequence 3 3 AC 400 V 690 V 2 C/O + + Switch cabinet: 22,5; 45 45
IL 9086,
SL 9086
Phase monitor with thermal motor protection, detection of under-/overvoltages, unbalance, phase failure, phase sequence 3 3/N AC  400/230 V 400 V 2 C/O

Distribution board: 35 Switch cabinet: 35
IL 9087,
SL 9087
Phase monitor with detection of under-/overvoltages, unbalance, phase failure, phase sequence 3 3/N AC  400/230 V 400 V 1 C/O;  2 C/O

Distribution board: 35 Switch cabinet: 35
IP 9111/107 Traformer protection: Current and temperature monitoring 1 5…50 A; > 3.8 kΩ 50 V 2x2 C/O
+ Distribution board: 70
IL 9077,
IP 9077,
SL 9077,
SP 9077
Over-/undervoltage relay, optionally with unbalance and phase-sequence detection 3 AC 400 V 480 V 2 C/O;  4 C/O +
Distribution board: 35; 70 Switch cabinet: 35; 70
C/O = changeover contact

DOLD Mains monitoring VARIMETER
DOLD Mains monitoring VARIMETER
DOLD offers you a very wide portfolio of relays for network monitoring. The devices monitor electrical variables such as voltage, phase outage/asymmetry, neutral conductor usage, frequency as well as insulation errors. Typical uses are device and system protections, the supply of safety lighting devices, et cetera. They distinguish themselves with benefits such as space-saving thanks to their compact size, simple functionality, flexible use, high efficiency and higher operating security as well as fire and accident safety.
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Type Function 1-/3- phase Standard measuring range * Max. measuring range Contacts Operate delay Auxiliary voltage required Housing style: Width [mm]
IL 9176 Undervoltage relay  with test key 3 3/N AC  400/230 V 400 V 2 C/O

Distribution board: 35
IL 9087,
SL 9087
Phase monitor with detection of under-/ overvoltages,  unbalance, phase failure, phase sequence 3 3/N AC  400/230 V 400 V 1 C/O;  2 C/O

Distribution board: 35 Switch cabinet: 35
BD 9080 Phase monitor with detection of under-/ overvoltages,  unbalance, phase failure, phase sequence 3 3AC 400V 690 V 2 C/O + + Switch cabinet: 45
IL 9086,
SL 9086
Phase monitor with thermal motor protection, detection of under-/ overvoltages, unbalance, phase failure, phase sequence 3 3/N AC  400/230 V 400 V 2 C/O

Distribution board: 35 Switch cabinet: 35
IK 9168,
SK 9168
Phase indicator 3 3/N AC  400; 230 V 400 V


Distribution board: 17.5 Switch cabinet: 17.5
RK 9872 Phase monitor 3 3/N AC  400; 230 V 400 V 1 C/O

Distribution board: 17.5
IK 9169,
RK 9169,
SK 9169
Phase monitor 3 3/N AC  400; 230 V 400 V 1 C/O

Distribution board: 17.5 Switch cabinet: 17.5
IL 9059,
SL 9059
Phase sequence relay 3 AC 380... 690 V 690 V 1 C/O

Installationsverteiler: 35 Schaltschrank: 35
OA 9059 Phase sequence relay 3 AC 380... 690 V 690 V 1NC

Motor terminal box: 62
BA 9041,
AI 941N
Phase sequence relay 3 3 AC 400 V 550 V 1 C/O;  2 C/O

Switch cabinet: 45
MK 9056,
MK9056N
Phase sequence relay 3 3 AC  380...500 V 500 V 2 C/O

Switch cabinet: 22,5
IK 9178,
SK 9178
Phase sequence indicator 3 3AC 400 V 3 AC 400 V


Distribution board: 17.5 Switch cabinet: 17.5
IK 9179,
RK 9179
SK 9179
Phase sequence monitor (Phase sequence relay) 3 3AC 400 V 3 AC 400 V 1C/O

Distribution board: 17.5 Switch cabinet: 17.5
AK 9840 Asymmetry relay 3 3AC 400 V 3 AC 690 V 2 C/O +
Switch cabinet: 75
BA 9040,
MK 9040N
Asymmetry relay 3 3AC 400 V 3 AC 690 V 2 C/O +
Switch cabinet: 22.5; 45
BA 9042,
AI 942
Asymmetry relay 3 3AC 400 V 3AC 400V 2 C/O

Switch cabinet: 45
BA 9837,
AA 9837
Frequency relay 1 30 ... 90 Hz 600 Hz 1 C/O;  2 C/O + + Switch cabinet: 45
IL 9837,
SL 9837
Frequency relay 1 5...200 Hz 300 Hz 1 C/O;  2 C/O + + Distribution board: 35 Switch cabinet: 35
IL 9069,
SL 9069
Neutral monitor 3 3/N AC  400; 230 V 415 V 2 C/O +
Distribution board: 35 Switch cabinet: 35
IL 9075,
IP 9075,
SL 9075,
SP 9075
Fuse monitor 3 3 AC  380 ... 415 V 690 V 2 C/O

Distribution board: 35 Switch cabinet: 35
UG 9075 Fuse monitor 3 3 AC  110...400 V 3AC 400V 2 C/O +
Switch cabinet: 22.5
IK 9143,
SK 9143
Frequency relay 1 50; 60 Hz 50/60 Hz 1 C/O + + Distribution board: 17.5 Switch cabinet: 17.5
MK 9837N,
MH 9837
Frequency relay 1 1,5…600 Hz 600 Hz 2 C/O
+ Switch cabinet: 22.5; 45
MK9837N/5_0,
MH 9837/ 5_0
Frequency relay 1 1,5…600 Hz 600 V 2 C/O + + Distribution board:: 22.5, 45
MK 9143N,
MH 9143
Mains frequency relay 1 50; 60 Hz 50/60 Hz 2 C/O;  4 C/O + + Switch cabinet: 22.5; 45
NC = normally closed contact; C/O = change-over contac
* Other measuring ranges on request

DOLD Voltage monitoring VARIMETER
DOLD Voltage monitoring VARIMETER
The DOLD measuring relays for voltage monitoring offer complete voltage protection for overload and under-load monitoring in one compact device. The under-load and overload relays and voltage monitor (single phase and three phase) protect consumers such as electric motors against overloading caused by under-loads and/or protect devices against destruction caused by overloads e.g. generators running in isolated operation with faulty regulation. An important area of use of this measuring relay is the single phase voltage monitoring in control circuits or DC control circuits.

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Type Function 1-/3-phase Max. measuring range Contacts Operate delay Auxiliary voltage required Housing style: Width [mm]
MK 9064N Voltage relay, digital 1 AC/DC  300 V 1 C/O + + Switch cabinet: 22.5
MH 9064 Voltage relay, digital 1 AC/DC  600 V 2 x 1 C/O + + Switch cabinet: 45
BA 9054,
MK 9054N
Voltage relay, under-/overvoltages 1 AC/DC  1000 V 2 C/O + + Switch cabinet: 45
BA 9036 Voltage relay 1 AC 660 V 1 C/O; 2 C/O +
Switch cabinet: 45
BA 9037 Voltage relay 1 AC 690 V 2 C/O +
Switch cabinet: 45
IK 9044,
IK 9046
Voltage relay undervoltage, overvoltage, residual ripple 1 DC 24 V 1 C/O; 2 C/O +
Distribution board: 17.5
IK 9170,
SK 9170
Overvoltage relay 3 AC 440 V 1 C/O; 2 C/O +
Distribution board: 17.5 Switch cabinet: 17.5
IK 9172,
SK 9172
Overvoltage relay 1 AC 230 V 1 C/O; 2 C/O +
Distribution board: 17.5 Switch cabinet: 17.5
IL 9077,
IP 9077,
SL 9077,
SP 9077
Over- and undervoltage relay 3 AC 480 V 2 C/O; 4 C/O +
Distribution board: 35: 70 Switch cabinet: 35: 70
BA 9043,
AA 9943
Undervoltage relay 3 AC 690 V 2 C/O +
Switch cabinet: 45 for front panel mounting
BC 9190N Undervoltage relay,  detection of short-time phase failures 1 AC 230 V 1 C/O; 2 C/O +
Switch cabinet: 22.5
IK 9171,
IL 9171,
SK 9171,
SL 9171
Undervoltage relay 3 AC 500 V 1 C/O; 2 C/O +
Distribution board: 17.5 Switch cabinet: 35
IK 9173,
SK 9173
Undervoltage relay 1 AC 400 V 1 C/O +
Distribution board: 17.5 Switch cabinet:17.5
IL 9071,
SL 9071
Undervoltage relay 3 AC 440 V 2 C/O +
Distribution board: 35 Switch cabinet: 35
RK 9871 Undervoltage relay 1; 3 AC 400 V 1 C/O; 2 C/O +
Distribution board: 17.5
IL 9079,
SL 9079
Undervoltage relay to detect auto-reclosing 3 AC 500 V 2 C/O +
Distribution board: 35 Switch cabinet: 17.5
IP 9109.27/107 Undervoltage relay for rooms used for medical purposes 1 AC 230 V 2 C/O +
Distribution board: 70
IP 9110/107 Undervoltage relay for rooms used for medical purposes 3 AC 400 V 1NO,  2 NC +
Distribution board: 70
IP 9109.17/107 Undervoltage relay for rooms used for medical purposes 1 AC 230 V 2 NO,  2 NC +
Distribution board: 70
BA 9054/331
BA 9054/332
Battery symmetry monitor 1 DC 0,12  ...1,2 V 2 C/O + + Switch cabinet: 45
NO = normally open contact, NC = normally closed contact, C/O = change-over contac
Following product are also available: IL 9070

DOLD Measuring relays for special applications VARIMETER
Measuring relays for special applications VARIMETER
DOLD offers you a comprehensive range of measuring relays for your individual needs and special applications. The devices detect and provide early notification if critical limits of electrical variables such as current, voltage, power, insulation resistance, et cetera are violated. This allows to avoid dangers to people and machinery. In addition, using DOLD VARIMETER relays, the availability of your machines and systems will be increased and production outages will be minimized. DOLD's portfolio ranges from standard devices for the monitoring of individual variables to multifunctional devices to flexible error message systems.
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Type Function 1-/3-phase Standard measuring range Contacts Adjustable operate delay Auxliary voltage required Housing style: Width  [mm]
RP 9800 Voltage and frequency monitor for generator sets on public grid 3 50 Hz; AC 230 V 2 C/O

Distribution board: 70
RP 9810 Voltage and frequency monitor for generator sets on public grid acc. to VDE-AR-N 4105 3 50 Hz; AC 400 /  230 V 3 C/O

Distribution board: 70
RP 9811 Voltage and frequency monitor for generator sets on public grid international 3 AC 400 /  230 V 3 C/O

Distribution board: 70
MK 9143N,
MH 9143
Mains frequency monitor for self-production plant 1 50 / 60 Hz 2 C/O;  4 C/O + + Switch cabinet: 22.5; 4
IP 9109.27/107 Undervoltage relay, f. med.areas acc. to  DIN VDE 0100-710 3 AC 230 V 2 C/O +
Distribution board: 70
IP 9109.17/107 Undervoltage relay, f. med.areas acc. to  DIN VDE 0100-710 3 AC 400 V 2 NO +  2 NC +
Distribution board: 70
IP 9110/107 Undervoltage relay, f. med.areas acc. to  DIN VDE 0100-710 3 AC 400 V 1 NO +  2 NC +
Distribution board: 70
IN 5880/710,
IN 5880/711
Insulation monitor, for med.areas acc. to  DIN VDE 0100-710 1 50...500 kΩ 2 C/O
+ Distribution board: 52,5; 70
BA 9054/331,
BA 9054/332
Battery symmetry monitor 1 0,12...1,2 V DC 2 C/O + + Switch cabinet: 45
IK 9076,
SK 9076
Valve monitor: current and  broken conductor monitoring 1 < 0,7A 1 C/O
+ IDistribution board: 17.5 Switch cabinet: 17.5
IP 9111/107 Transformer protection:  Current and temperarure  monitoring f. med.areas acc. to DIN VDE 0100-710 1 5…50 A; > 3.8 kΩ 2 x 2 C/O
+ Distribution board: 70
NO = normally open contact, NC = normally closed contact, C/O = change-over contac
Following product are also available: AI 940

DOLD Monitoring physical values VARIMETER
DOLD Monitoring physical values VARIMETER
For the monitoring of physical variables such as speed, temperature or fill level, DOLD features speed and/or standstill monitors, temperature monitors and thermistor motor protection relays as well as level relays especially for you. The DOLD measuring relays offer you advantages such as a safe monitoring of standstills in machine with rotating parts as well as a reliable monitoring of the motor condition during increasing temperatures. In the area of fill level measuring, a high measuring range allows liquid and foam to be distinguished between.
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Type Function Measuring range, max. Contacts Operate delay Housing style: Width [mm]
BD 5936 Stand-still monitor
2 NO, 2 NC
Switch cabinet: 45
IK 9144,
SK 9144
Stand-still monitor 300000 IPM 1 C/O + Distribution board: 17.5; 35
BA 9055,
AA 9050
Speed monitor 10000 IPM 1 C/O + Switch cabinet: 45
IK 9055, IL 9055,
SK 9055, SL 9055
Speed monitor 600000 IPM 1 C/O + Distribution board: 17.5; 35 Switch cabinet: 17.5; 35
MK 9055N,
MH 9055
Speed monitor 120000 IPM 2 C/O
Distribution board: 22.5; 45
MK 9055N/5_0,
MH 9055/5_0
Speed monitor 120000 IPM 2 C/O
Distribution board: 22.5; 45
IL 9151, SL 9151,
MK 9151N
Level sensing relay 450 kΩ 2x1 C/O + Distribution board: 35 Switch cabinet: 22.5; 35
BA 9094 Temperature relay 600 °C 1 C/O,  1 NO
Switch cabinet: 35
IK 9094, IL 9094,
SK 9094, SL 9094
Temperature relay 300 °C 1 C/O
Distribution board: 17.5; 35 Switch cabinet: 17.5; 35
BA 9038,
AI 938
Thermistor motor  protection relay > 3.8 kΩ 2 C/O
Switch cabinet: 45
IL 9163,
SL 9163
Thermistor motor  protection relay > 3.8 kΩ 2 C/O
Distribution board: 35 Switch cabinet: 35
MK 9163N,
MK 9163N-ATEX
Thermistor motor  protection relay > 3.8 kΩ 2 C/O
Switch cabinet: 22.5
MK 9003-ATEX Thermistor motor  protection relay > 3.1 kΩ 2 C/O
Switch cabinet: 22.5
IP 9111/107 Transformer protection:  Current and temperature  monitoring 5…50 A; > 3.8 kΩ 2x2 C/O
Distribution board: 70
IK 9076,
SK 9076
Valve monitor: current and  broken conductor monitoring < 0.7A 1 C/O
Distribution board: 17.5 Switch cabinet: 17.5
NO = normally open contact, NC = normally closed contact, C/O = changeover contact

DOLD Current monitoring VARIMETER
DOLD Current monitoring VARIMETER
DOLD current relays are electronic measuring relays for monitoring AC and DC currents for exceeding or falling below a pre-set value. Depending on the version, one or more consumers can be monitored with one device. Special applications where current sense relays can be used are stone and woodworking machinery and where necessary to monitor over or under voltage. DOLD Current monitoring measuring relays are characterized by a large number of monitoring functions in a compact design width.
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Type Function 1-/3-phase Max. measuring range Contacts Operate delay Auxiliary voltage required Housing style: Width [mm]
MK 9053N Over-/undercurrent relay 1 10 A 2 C/O + + Switch cabinet: 22.5
BA 9053 Over-/undercurrent relay 1 25 A 1 C/O /  2 C/O + + Switch cabinet: 45
IL 9277,  SL 9277 Over-/undercurrent relay 1 15 A 2 C/O + + Distribution board: 35 Switch cabinet: 35
SL 9277CT Over-/undercurrent relay 1 100 A 2 C/O + + Switch cabinet: 35
IP 9277,
SP 9277
Over-/undercurrent relay 3 15 A 2 x 2 C/O + + Distribution board: 70 Switch cabinet: 70
SP 9277CT Over-/undercurrent relay 3 100 A 2 x 2 C/O + + Switch cabinet: 70
IK 9270,
SK 9270
Ovecurrent relay 1 15 A 1 C/O + + Distribution board: 17.5 Switch cabinet: 17.5
IL 9270,
SL 9270
Ovecurrent relay 1 50 A 1 C/O /  2 C/O + + Distribution board: 35 Switch cabinet: 35
IP 9270,
SP 9270
Ovecurrent relay 3 15 A 2 C/O + + Distribution board:  70 Switch cabinet: 70
SL 9270CT,
SP 9270CT
Ovecurrent relay 3 100 A 2 C/O + + Switch cabinet: 35; 70
IK 9272,
SK 9272
Ovecurrent relay 1 10 A 2 C/O + + Distribution board: 17.5 Switch cabinet: 17.5
IL 5201/20007 Ovecurrent relay 1 5 A 1 C/O + + Distribution board: 35
SL 5201/20007CT Ovecurrent relay 1 50 A 2 x 1 C/O + + Switch cabinet: 35
IK 9271,
SK 9271
Ovecurrent relay 1 15 A 2 x 1 C/O + + Distribution board: 17.5 Switch cabinet: 17.5
IL 9271,
SL 9271
Undercurrent relay 1 50 A 1 C/O + + Distribution board:  35 Switch cabinet: 35
IP 9271,
SP 9271
Undercurrent relay 1 15 A 1 C/O; 2 C/O + + Distribution board:  70 Switch cabinet: 70
SL 9271CT Undercurrent relay 1 100 A 2 C/O + + Distribution board: 35
SP 9271CT Undercurrent relay 3 100 A 2 C/O + + Switch cabinet: 70
IK 9273 ,
SK 9273
Undercurrent relay 1 10 A 2 C/O + + Distribution board: 17.5 Switch cabinet: 17.5
IK 8839,
IL 8839
Current monitor 1 40 A 1 C/O
+ Distribution board: 17.5; 35
IK 9138,
IK 9839
Current monitoring system, modular extension possible 1 16 A 1 C/O
+ Distribution board: 17.5
IP 9278,
SP 9278
Current-assymmetry- relay 3 15 A 1 C/O; 1 NO + + Distribution board: 70 Switch cabinet: 70
SP 9278CT Current-assymmetry- relay 3 100 A 2 C/O + + Switch cabinet: 70
NO = normally open contact, NC = normally closed contact, C/O = change-over contac
Following product are also available: ML 9701

DOLD Accessories for measuring relays
DOLD Accessories for measuring relays
Frequency converters are increasingly used in installations. Their output generates steep switching edges that cause significant EMC interference and high frequency compensation currents in the connected switching components. The devices connected to the converter could suffer interference or possibly be damaged. Interference suppressor filters from DOLD can ensure a wide range of interference suppression up to high frequencies. Through the intermediate switch of interference suppressor filter between the converter and the measuring relay whose interference is to be suppressed and/or device, interference and even destruction of the connected devices is avoided.
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Type Function 3-phase Nominal voltage UN max. Housing style Width [mm] Depth  [mm]
without PE  connectoin with PE  connectoin
MK 5130N,
LG 5130
Noise filter + 3 AC 1000 V 3/N AC 860/500 V Switch cabinet: 22.5 97 121

Technical Information and Features

DOLD VARIMETER PRO: The multifunctional measuring relay.

Complex processes in automation, process and industrial building systems, together with increasing demands in energy and environmental engineering require high operating reliability and permanent availability of the system. The universal measuring relays MK 9300N / MH 9300 of the VARIMETER PRO series monitor up to 9 different parameters simultaneously. Quite simply and without much wiring effort. Whether simultaneous overvoltage/undervoltage, voltage asymmetry, overcurrent/undercurrent, cos phi, active power, apparent power and reactive power, frequency and phase sequence in three-phase and singlephase networks - a measuring relay for all scenarios. Thanks to its menu structure the measuring relay can be operated easily and intuitively.

Your benefits at a glance:
- Simultaneous monitoring of up to 9 measured variables
- Overvoltage, undervoltage or window monitoring
- Simple parametrisation and fault diagnostics on the device
- Differentiated fault messages
- Large measuring range 3 AC 24 ... 690 V
- Large auxiliary voltage range DC 24 V, AC 230 V or AC/DC 110 ... 400 V
- Variable terminal configurations through plug-type screw or spring-loaded terminals
- Early detection of irregularities protects your equipment
- Timely intervention increases the availability
- Cost-effective and space-saving
- Reduced wiring effort.

Maximum output function for your application with DOLD.

Precise monitoring and diagnosis in machines and plants has gained increasing significance over the past years. The early detection of impending failures and preventive maintenance prevent costly damages. The VARIMETER PRO is the basis for reliable monitoring. As user you will benefit from the operating reliability and high availability of your system. Secure this economic advantage.
Maximum output function for your application with DOLD.
Comparison Flexibility – Price.
DOLD Comparison Flexibility – Price
The right solution for each requirement: The VARIMETER PRO from DOLD is unbeatable in the price-performance ratio if several monitoring functions shall be carried out simultaneously. DOLD offers the perfect solution as well for all monofunctional measuring tasks.

DOLD VARIMETER motor load monitor MK 9397N, MH 9397 overview.

The Load monitor MK9397 and MH9397 of the varimeter family monitor reliably the load of motors as well as the function of 3 phase electrical users. If the measured value falls under or goes over the adjusted settings the corresponding output relay is energised. To avoid unnecessary tripping a response delay tv can be adjusted between 0 and 10 s. LEDs show the status of the output relays.

Your Advantage:
- Preventive maintenance
- For a evaluate time
- Quicker fault locating
- Precise and reliable
- Overload detection, as option also with prewarning
- Can also be used for underload monitoring
- Simple adjustment and fault diagnostics
- Space and cost saving

Application:
The load monitor is suitable to monitor industrial motors with variable load as well as to monitor the correct function of electrical users. The units can detect in time wearing or failures on machines and tools. So maintenance can be carried out before a plant stops.

Function:
The load monitor monitors the effective power of electrical consumers. As the current is only measured in one phase a symmetric load in a 3 phases is assumed. as it is usual with motors. The setting value is adjusted with potentiometers, the range selection by rotational switches. The MH 9397 has 2 response values (e.g. for prewarning).
DOLD VARIMETER motor load monitor MK 9397N, MH 9397 overview.

DOLD Fuse Monitor IL 9075, IP 9075, SL 9075, SP 9075.

Fuse monitoring in the three-phase mains, e.g. for automatic switching-off and switch-on blockage of three-phase motors in the event of one or more phase fuses failing.
DOLD Fuse Monitor IL 9075, IP 9075, SL 9075, SP 9075
The internal resistance of the fuse monitor's measuring path is in the MOhm range, meaning that the regulations as regards touch voltage are fulfilled if a fuse is not present or if it is faulty (IEC 974-1, internal resistance > 2000 Ohm/V).

DOLD VARIMETER PRO Over- and Undervoltage Relay IL 9077, IP 9077, SL 9077, SP 9077.

All 3 phase voltages are measured with N (L1 and L2 are measured against L3 in the case of equipment without an N connection). If they are in the acceptable range, a green LED goes on and the output relay is activated. If at least one phase exceeds the setting value for overvoltage (variable between 0.9 ... 1.3 UN) or if at least one phase falls short of the setting value for undervoltage (variable between 0.7 ... 1.1 UN), the output relay releases after the set time delay and the green LED goes off (fault state). 2 red LEDs then indicate the cause of the fault:
- Undervoltage " < U"
- Overvoltage " > U"
When all 3 phase voltages are below the chosen setting value for overvoltage and above the chosen setting value for undervoltage again, the relevant red LED goes out, the output relay is activated again and the green LED goes on again (acceptable state). When the system returns to an acceptable state, there is a hysteresis of about 4 % of the set value with both the set voltage thresholds. On the unit with phase sequence detection IL/SL 9077/003 (only available without neutral) the wrong phase sequence is handled like undervoltage: The red LED ".
DOLD VARIMETER PRO Over- and Undervoltage Relay IL 9077, IP 9077, SL 9077, SP 9077.
Applications:
Monitoring of three-phase voltage systems to identify overvoltage and undervoltage, e.g. to monitor in-house generation equipment in accordance with VDE 0100.