Motor Protection Motor Protection | Show |
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Motor Protection Motor Protection | Hide |
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Input Voltage Input Voltage |
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Mounting Location Mounting Location |
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Switching Voltage Switching Voltage |
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Reset Type Reset Type |
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Relay Type Relay Type |
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![]() | Standard |
Switching Current Switching Current |
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Number of Circuits Controlled Number of Circuits Controlled |
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Trip Time Trip Time |
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Wire Connection Type Wire Connection Type |
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![]() | Screw Terminals |
Switch Starting Position Switch Starting Position |
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Operation Type Operation Type |
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Auxiliary Contact Switch Starting Position Auxiliary ContactSwitch Starting Position |
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Industry Designation Industry Designation |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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About Motor Switches and Starters
More
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 | |||||||||||
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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 | |||||||||||||
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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 | ||||||||||||||
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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.
Overload Current, A | Trip Time, sec. | Overload Protection Class | Motor Protection | Ht. | Wd. | Dp. | Wire Connection Type | Specifications Met | Each | |
2 Auxilliary Contacts with 1 Off (Normally Open), 1 On (Normally Closed) | ||||||||||
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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 |