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Struthers-Dunn - Leaders in Relays & Controls Since 1923
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Relays & Controls
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Sensitive - Low Input Power Timer/Sensor Reed Accessories and Sockets

The 575 series relay is rated to 7.5HP. Two sets of 3 pole, double-make, N.O. contacts are mechanically interlocked to prevent simultaneous closure. Front mounted auxiliary contacts are available for electrical lockup. The 575 motor revering contactor is widely used for control of overhead doors, elevators, hoists, machine tools, and others similar devices that requires frequent jogging.

Additional contact configurations and coil options are available – please use the RFQ/RFI tab above to submit your request.
UL Recognized & CSA
Unit of Measure



N/A 575

Contact Arrangement

N/A KXX (2X 3PST – N.O. – double make)

Coil Voltage

N/A 24 VDC


Contact Configuration

N/A 3PST-NO Double Make per side

Contact Material

N/A Silver Alloy

Contact Rating

N/A 30 A

Contact Rating 120 / 240VAC Resistive

N/A 30 A

Motor 120VAC 1 Phase

N/A 1.5 hp

Motor 240VAC 1 Phase

N/A 3 hp

Motor 240VAC 2-3 Phase

N/A 5 hp

Motor 480 / 600VAC 2-3 Phase

N/A 7.5 hp

Contact Resistance, Initial

N/A 100 milliohms max at 6VDC


Coils Available

N/A AC and DC

Nominal Coil Power AC

N/A 22 VA

Nominal Coil Power DC

N/A 10 W

Input Voltage Tolerance - AC

N/A 85% to 110% of nominal

Input Voltage Tolerance - DC

N/A 80% to 110% of nominal

Drop-out voltge

N/A 10% of nominal


N/A Continuous


Operate Time (max)

N/A 60 ms

Release Time (max)

N/A 30 ms

Dielectric Strength

Across Open Contacts

N/A 2500 Vrms

Between Mutually Insulated Point

N/A 2500 Vrms

Insulation Resistance

N/A 1000 megohms at 500Vrms



N/A -34 to 74 ºC-30 to 165 ºF


N/A -40 to 105 ºC-40 to 221 ºF

Life Expectancy

Electrical (full load)

N/A 100,000

Mechanical (no load)

N/A 1,000,000


Mounting Position

N/A Vertical , Contacts Up


N/A Semi-Enclosed


N/A 42.0 oz1100 g