Phase Loss Relays | McMaster-Carr

	Motor Protection Motor Protection

Overvoltage

Phase Loss

Phase Reversal

Undervoltage

Voltage Imbalance

	Maximum Input Voltage Maximum Input Voltage

480V AC

600V AC

	Minimum Input Voltage Minimum Input Voltage

190V AC

200V AC

475V AC

	Mounting Location Mounting Location

DIN Rail

Surface

Relay Socket

	Reset Type Reset Type

Automatic

Delayed Automatic

	Width Width

1.8"

2.08"

	Depth Depth

2.35"

4.3"

	Number of Terminals Number of Terminals

	Height Height

2.4"

3.5"

	Maximum Trip Time Maximum Trip Time

30 sec.

500 sec.

	Minimum Trip Time Minimum Trip Time

0.25 sec.

1 sec.

	Control Power Control Power

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Maximum Voltage Imbalance Adjustment Maximum Voltage Imbalance Adjustment

10%

	Mechanical Life Cycles Mechanical Life Cycles

1,000,000

10,000,000

	Specifications Met Specifications Met

CSA

	Mounting Hole Diameter Mounting Hole Diameter

5 Products

Surface-Mount Motor Voltage Monitors

Protect electric motors from phase loss, phase reversal, overvoltage, undervoltage, and voltage imbalance. Also known as voltage-monitoring relays, these monitors cut power to a motor when a fault occurs.

For technical drawings and 3-D models, click on a part number.

				Trip Time, sec.		Switching
Input Voltage Range	No. of Terminals	Control Power, W	Voltage Imbalance Adjustment	Automatic Reset	Delayed Automatic Reset	Current, A	Voltage	Ht.	Wd.	Specifications Met		Each
1 Circuit Controlled with 1 Off (Normally Open) or 1 On (Normally Closed)—SPDT
Three Phase
190-480V AC	7	6	2%-8%	1-30	1-500	10	240V AC	3.5"	2.08"	UL Listed	0000000	000000
475-600V AC	7	6	2%-8%	1-30	1-500	10	240V AC	3.5"	2.08"	UL Listed	0000000	000000

DIN-Rail Mount Motor Voltage Monitors

Mount these monitors to 35 mm DIN rail. They protect electric motors from phase loss, phase reversal, overvoltage, undervoltage, and voltage imbalance. Also known as voltage-monitoring relays, they cut power to a motor when a fault occurs.

For technical drawings and 3-D models, click on a part number.

						Switching
Input Voltage Range	No. of Terminals	Control Power, W	Voltage Imbalance Adjustment	Trip Time, sec.	Reset Type	Current, A	Voltage	Horsepower @ Voltage	Ht.	Wd.	Specifications Met		Each
1 Circuit Controlled with 1 Off (Normally Open) or 1 On (Normally Closed)—SPDT
Three Phase
200-480V AC	9	5	2%-10%	1-30	Automatic	10	240V AC	1/3 hp @ 240 V AC	3"	2"	UL Listed, C-UL Listed	0000000	0000000

Socket-Mount Motor Voltage Monitors

Plug these monitors into relay sockets for fast installation and replacement. They protect electric motors from phase loss, phase reversal, overvoltage, undervoltage, and voltage imbalance. Also known as voltage-monitoring relays, they cut power to a motor when a fault occurs.

Relay sockets (sold separately) mount to 35 mm DIN rail or flat surfaces.

Voltage Monitors
						Switching							Relay Sockets
Input Voltage Range	No. of Terminals	Control Power, W	Voltage Imbalance Adjustment	Trip Time, sec.	Reset Type	Current, A	Voltage	Ht.	Wd.	Specifications Met		Each		Each
1 Circuit Controlled with 1 Off (Normally Open) or 1 On (Normally Closed)—SPDT
Three Phase
200-480V AC	8	5	2%-10%	0.25-30	Automatic	10	240V AC	2.4"	1.8"	UL Recognized Component, CSA Certified	0000000	0000000	0000000	00000