Mars Contactor Power-Power 24V M90340

The Mars M90340 is a switching relay with a 24 volt coil, used for control switching in HVAC equipment.

A relay differs from a contactor in scale and purpose. Where a contactor switches power loads such as compressors and large motors, a relay switches control circuits and smaller loads, and it typically offers contact arrangements a contactor does not, including normally closed contacts that open when the coil is energised.

That normally closed capability is what makes relays useful in control logic. A relay can interlock two functions so that one cannot operate while the other does, invert a signal, isolate one control circuit from another, or provide additional contacts where a control board has run out.

Common applications in HVAC include fan control, where a relay energises the indoor blower on a call for cooling independently of the compressor circuit, interlocking a damper or an accessory with equipment operation, isolating a low voltage signal from a different voltage circuit, and adding switched outputs to an existing control scheme.

Relay coils are voltage specific, and a 24 volt coil is energised from the equipment's control transformer.

Applications include residential and commercial HVAC control circuits, refrigeration controls, and accessory switching.

Brand

Mars

SKU

M90340

Category

Contactors

Weight

0.4 lbs

Dimensions

3.10" x 2.10" x 2.00"

Price

$30.00

Availability

In stock

Rating

4.9 / 5.0