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Download Full Product Catalog - Durex Industries

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46<br />

PROCESS HEATER WIRE DIAGRAMS<br />

TYPICAL WIRING DIAGRAMS FOR HEATERS WITH THERMOSTATS<br />

L1<br />

L2<br />

L1<br />

L2<br />

When Heater Amperage Does Not Exceed the Amperage of the Thermostat<br />

Fused Disconnect<br />

Thermostat<br />

SPST<br />

Heater<br />

190 Detroit Street • Cary, Illinois 60013 • Phone: 847-639-5600 • Fax: 847-639-2199 • Web: www.durexindustries.com • TOLL FREE: 800-762-3468<br />

L1<br />

L2<br />

L3<br />

Fused Disconnect<br />

Thermostat<br />

DPST<br />

120V Single-Phase Heater Three-Phase Heater<br />

Fused Disconnect<br />

When Heater Amperage Exceeds the Amperage of the Thermostat<br />

Thermostat<br />

SPST<br />

Magnetic Contactor<br />

Heater<br />

L1<br />

L2<br />

L3<br />

Fused Disconnect<br />

Thermostat<br />

DPST<br />

Any Voltage Single-Phase Heater Three-Phase Heater<br />

Use a Single Pole-Single Throw (SPST) thermostat wired<br />

in series with the holding coil of a magnetic contractor<br />

or mercury relay (pilot duty).<br />

Fuses<br />

Heaters<br />

Heaters<br />

Magnetic Contactor<br />

Use a Double Pole-Single Throw (DPST) thermostat wired<br />

in series with the holding coil of a magnetic contractor<br />

or mercury relay (pilot dury).

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