Honeywell fan control thermal switches are specifically designed and qualified to operate the cooling fan contactor on EMD locomotive engines. This thermal switch is non-adjustable, thermally stable and is provided in a continuous range of temperature set points shown in the table below.
It uses large rugged contacts, high armature force and large snap-acting discs. This enables the fan control thermal switch to meet rugged performance requirements.
The base sensing module of the switch is a hermetically sealed element ensuring long life through a large range of environments. In addition, the cover, connector and push button are environmentally sealed to provide protection from steam cleaning and other harsh chemicals used on today's locomotives.
Each switch comes with a press to test push button switch. This aids in verifying proper wiring and connection to fan controls and over-temperature alarms.
- Fan temperature control
- Overtemperature idle control
- Low-idle temperature control
- Overtemperature alarm
- Fluid dump freeze protection
Thermal Management Switches
Honeywell thermal management switches are specifically designed for applications that require high current capacity and are subject to high vibration and shock. This series is capable of handling 7 amperes resistive load at 120 VAC RMS and 2.5 amperes inductive load at 28 VDC.
This series comes as single-pull, single-throw or single-pull, double-throw configurations.
The base sensing module of the switch is a bimetallic element ensuring long life through a large range of environments.
- Low idle temp control - locomotive
- Low water temp alarm
- Compressor overtemp
- Transmission overtemp
Thermal switches exported from the United States must be done in accordance with the export administration regulations (EAR) and/or the international traffic in arms regulations (ITAR) as applicable.