Phase Loss Relays | McMaster-Carr

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	Motor Protection Motor Protection	Show

Phase Loss

	Motor Protection Motor Protection	Hide

	Input Voltage Input Voltage

190-480V AC

200-480V AC

475-600V AC

	For Electrical Phase For Electrical Phase

Three

Single

	Mounting Location Mounting Location

Relay Socket

DIN Rail

Surface

	Switching Voltage Switching Voltage

240V AC

	Number of Terminals Number of Terminals

	Reset Type Reset Type

Automatic

Delayed Automatic

	Relay Type Relay Type

	Standard

	Overload Current Range Overload Current Range

	Switching Current Switching Current

10A

	Number of Circuits Controlled Number of Circuits Controlled

	Specifications Met Specifications Met

CSA

	Overload Protection Class Overload Protection Class

	Trip Time Trip Time

	Control Power Control Power

	Wire Connection Type Wire Connection Type

	Screw Terminals

	Switch Starting Position Switch Starting Position

1 Off (Normally Open) or 1 On
(Normally Closed)

	Operation Type Operation Type

Mechanical

	Auxiliary Contact Switch Starting Position Auxiliary Contact Switch Starting Position

1 Off (Normally Open)

1 On (Normally Closed)

	Number of Mounting Holes Number of Mounting Holes

	Industry Designation Industry Designation

SPDT

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

DFARS Specialty Metals
COTS-Exempt

	Height Height

13 Products

About Motor Switches and Starters

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	0000000
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

Overload Protectors for Motor Starters

Upgrade motor starters that use thermal overload protection with these solid-state overloads—they don't use heating elements, so enclosure ventilation and cooling is not required. All have a full-load amp adjustment dial to accommodate circuits with different full-load amp ratings.

If the full-load amp rating is not shown on your motor’s faceplate, estimate the current rating (given the motor’s horsepower and voltage).

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

2 Auxilliary Contacts with 1 Off (Normally Open), 1 On (Normally Closed)
Overload Current, A	Trip Time, sec.	Overload Protection Class	Motor Protection	Ht.	Wd.	Dp.	Wire Connection Type	Specifications Met		Each
Single Phase
3-12	5, 10, 20, 30	5, 10, 20, 30	Overvoltage, Phase Loss	2.2"	3.5"	3.2"	Screw Terminals	UL Listed, CSA Certified	0000000	0000000
5.5-22	5, 10, 20, 30	5, 10, 20, 30	Overvoltage, Phase Loss	2.2"	3.5"	3.2"	Screw Terminals	UL Listed, CSA Certified	0000000	000000
Three Phase
0.75-3.4	5, 10, 20, 30	5, 10, 20, 30	Overvoltage, Phase Loss	3.2"	3.5"	3.2"	Screw Terminals	UL Listed, CSA Certified	0000000	000000
3-12	5, 10, 20, 30	5, 10, 20, 30	Overvoltage, Phase Loss	2.2"	3.5"	3.2"	Screw Terminals	UL Listed, CSA Certified	0000000	000000
5.5-22	5, 10, 20, 30	5, 10, 20, 30	Overvoltage, Phase Loss	2.2"	3.5"	3.2"	Screw Terminals	UL Listed, CSA Certified	0000000	000000
10-40	5, 10, 20, 30	5, 10, 20, 30	Overvoltage, Phase Loss	2.2"	3.5"	3.2"	Screw Terminals	UL Listed, CSA Certified	0000000	000000
13-52	5, 10, 20, 30	5, 10, 20, 30	Overvoltage, Phase Loss	2.3"	4.5"	4"	Screw Terminals	UL Listed, CSA Certified	0000000	000000
25-100	5, 10, 20, 30	5, 10, 20, 30	Overvoltage, Phase Loss	2.3"	4.5"	4"	Screw Terminals	UL Listed, CSA Certified	0000000	000000

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About Motor Switches and Starters

Surface-Mount Motor Voltage Monitors

DIN-Rail Mount Motor Voltage Monitors

Socket-Mount Motor Voltage Monitors

Overload Protectors for Motor Starters