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The most reliable PHASE MONITORS & VOLTAGE sensing relays on the market are offered in the following configurations :

 

 

PHASE LOSS can occur when a fuse on one leg of a three phase system blows. A three phase motor operating under such a condition will eventually burn out. Depending on the load, the motor could regenerate up to 92% of the nominal voltage so it's important to select a phase monitor which has a user selectable adjustment to protect against this condition. In a four wire application, use a unit with a -4W suffix as these also detect loss of the neutral.

PHASE SEQUENCE is important for the correct rotation of the motor. Incorrect phase sequence can lead to machinery being damaged and perhaps serious injury to personnel.

PHASE IMBALANCE or ASYMMETRY is caused by single phase loads being primarily connected between the same two phases of a three phase system. A three phase motor runs much hotter under such a condition, considerably shortening its life.

VOLTAGE and CURRENT monitoring of three phase systems to insure that these do not exceed or drop below critical values is paramount for keeping machinery running at correct speed and problem free.

THERMISTORS are sometimes incorporated in the motor's windings measuring the resistance which increases as the temperature in the motor increases. Our 45PTR will react to this input as well as phase loss, incorrect sequence and under voltage conditions.

 
Z5 Series   DIN Rail & Surface Mtg

Z5PM

H.91 W.52.5 D.61(mm)

Model No
Function 3 Phase Under/Over Voltage/Sequence/Loss
Under / Over Voltage Under & Over
Adjustable Trip Level Yes
Phase Loss (Failure) Yes
Neutral Loss No
Phase Sequence (Rotation) Yes
Phase Asymmetry Yes
Time Delay (from fault) Adjustable
Output DPDT Relay
Output Rating 10 A @ 277VA/30VDC
Integral Transformer -
Supply Voltage Un/U 460 – 600Vac phase to phase -20% to +10%
Monitoring Range Monitors own supply
L Series   DIN Rail & Surface Mtg

m3

H.89 W.35 D.59 (mm)
Model No M3PPI M3PRC M3PRT-4W Z3PMF6
Function Phase Sequence, Loss Indicator Phase Sequence, Failure, Under & Over Voltage Phase Under Voltage, Sequence, Loss Phase Sequence, Failure, Under & Over Voltage
Under / Over Voltage - Under & Over Under Under & Over
Adjustable Trip Level No Yes Yes No
Phase Loss (Failure) Yes Yes Yes Yes
Neutral Loss No No Yes No
Phase Sequence (Rotation) Yes No Yes Yes
Phase Asymmetry No No No Yes
Time Delay (from fault) - 0.2 - 10S 0.2 - 10S 0.2s fixed
Output - 1 x SPDT Relay 1 x SPDT Relay SPDT Relay
Output Rating - 8A @ 250VAC 8A @ 250VAC 8A @ 277VAC
Integral Transformer No No No No
Supply Voltage Un/U 300 to 500VAC 220VAC 300 to 500VAC 160 - 600VAC
180 to 260VAC - 180 to 260VAC -
Monitoring Range Monitors own supply Monitors own supply Monitors own supply Monitors own supply
L Series   DIN Rail & Surface Mtg

 

LXP

H.89 W.17.5 D.66.5 (mm)
Model No M1PRT LXPRC/S LXPRT LXPRC/S/RD
Function Phase Sequence, Loss, Under Voltage Phase Sequence, Loss, Under & Over Voltage Phase Sequence, Loss, Under Voltage Phase Sequence, Loss, Under & Over Voltage
Under / Over Voltage Under Over & Under Under Over & Under
Adjustable Trip Level Yes Yes Yes No
Phase Loss (Failure) Yes Yes Yes Yes
Neutral Loss No No No No
Phase Sequence (Rotation) Yes Yes Yes Yes
Phase Asymmetry No Yes No No
Time Delay (from fault) 0.2 - 10S (adjustable) 0.2 - 10S (adjustable) 0.2 - 10S (adjustable) 4S fixed
Output SPDT Relay SPDT Relay SPDT Relay SPDT Relay
Output Rating 8A @ 250VAC (AC1) 8A @ 250VAC (AC1) 8A @ 250VAC (AC1) 8A @ 250VAC (AC1)
Integral Transformer No No No No
Supply Voltage Un/U U: 280 - 520V phase to phase 110V, 208V, 380V, 400V or 415VAC Un: 77-143, 161-300V, 280-520V L-L Un: 180-264V, 342-506V L-L
Monitoring Range Monitors own supply Monitors own supply Monitors own supply Monitors own supply
L Series   DIN Rail & Surface Mtg

 

LXP

H.89 W.17.5 D.66.5 (mm)

Type No LXPRC/S-4W LPRC/2 3&4W LPMP/2 3&4W LPMR/AUX
Function Phase Sequence, Loss, Under & Over Voltage Phase Sequence, Loss, Under & Over Voltage Phase Assymmetry, Sequence, Loss, Under & Over Voltage Phase Unbalance, Sequence, Loss
Under / Over Voltage Over & Under Over & Under Over & Under -
Adjustable Trip Level Yes Yes Fixed No
Phase Loss (Failure) Yes Yes Yes Yes
Neutral Loss Yes Yes Yes No
Phase Sequence (Rotation) Yes Yes Yes Yes
Phase Asymmetry Yes Yes Adjustable Yes
Time Delay (from fault) 0.2 - 10S (adjustable) 0.2 - 10S (adjustable) 0.2 - 10S (adjustable) <200mS
Output SPDT Relay 2 x SPDT Relay DPDT Relay SPST Relay
Output Rating 8A @ 250VAC (AC1) 5A @ 250VAC (AC1) 5A @ 250VAC (AC1) 6A@24VAC
Integral Transformer No No No No
Supply Voltage Un/U Un: 90-300V L-Nl

Un: LV 70-220V L-L & 63.5-127V L-N

Un: HV 380 - 415 L-L & 220-240V L-N

Un: 380-415 L-L, 3W

Un: 220-240 L-N, 4W

24Vac 48-63Hz
Monitoring Range Monitors own supply Monitors own supply Monitors own supply 190-600Vac
L Series   DIN Rail & Surface Mtg

 

LXP

H.89 W.17.5 D.66.5 (mm)

Type No LPPI LPRA/2_3&4W
Function Phase Sequence, Failure Indicator Phase Assymmetry, Sequence, Loss, Under Voltage
Under / Over Voltage - Under Voltage
Adjustable Trip Level No Asymmetry
Phase Loss (Failure) Yes Yes
Neutral Loss No Yes
Phase Sequence (Rotation) Yes Yes
Phase Asymmetry No Yes
Time Delay (from fault) No Yes
Output On board LED DPDT Relay
Output Rating - 5A @ 250VAC (AC1)
Integral Transformer No No
Supply Voltage Un/U 320-490VAC

380-415VAC L-L, 3W

220-240 L-N, 4W

Monitoring Range Monitors own supply Monitors own supply
70 Series   DIN Rail & Surface Mtg

70

H.70 W.100 D.114 (mm)

 

 

 

 

 

WHILE SUPPLIES LAST

Type No 70PCVR 70PCVR-4W
Function Three Phase Under & Over Voltage/Loss Three Phase Under & Over Voltage/Loss
Under / Over Voltage Under & Over Under & Over
Adjustable Trip Level Yes Yes
Phase Loss (Failure) Yes Yes
Neutral Loss No Yes
Phase Sequence (Rotation) No No
Phase Asymmetry No No
Time Delay (from fault) ~200mS ~200mS
Output 2 x DPDT Relays 2 x DPDT Relays
Output Rating 8A @ 250VAC 8A @ 250VAC
Integral Transformer Yes Yes
Supply Voltage Un/U 220, 380, 400VAC 220, 380, 400VAC
Monitoring Range Monitors own supply Monitors own supply