Automotive Temperature Switches
Rugged snap-action thermostat switches that trip a contact at a precise temperature — for radiator fan switching, over-temperature warning and compressor cut-out. SPST / SPDT, ±3°C tolerance, 8°C differential, -40°C to +150°C, IP67. No ECU required.
Common Uses:
- Radiator Fan Switching
- Engine Over-Temperature Warning
- HVAC Compressor Cut-Out
Switch Specs:
Need a continuous temperature reading instead? See temperature sensors →
How a temperature switch works
A bimetallic disc or thermo-mechanical element flexes with temperature. When the setpoint is reached the disc snaps over centre and toggles an electrical contact — driving a fan relay, warning lamp or protection circuit directly.
Setpoint
The temperature at which the contact changes state, calibrated to ±3°C.
Differential
8°C reset differential prevents contact chatter near the setpoint.
SPST vs SPDT
Single make/break, or common + NO + NC for dual-circuit switching.
Snap action
Bimetallic or thermo-mechanical snap mechanism for fast, repeatable switching.
Where threshold switching matters
Switches are specified when the system only needs to know it has crossed a thermal limit — for fan cut-in, alarms, cut-offs and protection circuits.
Radiator Fan Switching
Closes the fan relay when coolant temperature crosses the cut-in point and opens it on cool-down — direct relay-drive without ECU.
Engine Over-Temperature Warning
Trips the dashboard warning lamp the instant coolant or oil temperature exceeds the safe threshold.
HVAC Compressor Cut-Out
High/low temperature switches protect the A/C compressor by cutting the clutch circuit outside the safe operating window.
Cooling Fan & Pump Cycling
Temperature-actuated switching to cut in/out auxiliary cooling fans and circulation pumps via deadband.
Battery Thermal Protection
Over-temperature cut-out switches for battery packs and charging circuits, opening the contactor above the safe limit.
Equipment Thermal Protection
Snap switches for motor windings, transformers and power electronics to disconnect on over-temperature.
Technical Specifications
Setpoint and differential calibrated per customer drawing. Contact us for an OEM quotation.
Temperature Switch Series
Temperature Switch FAQ
Frequently Asked Questions
Engineering answers to the questions our customers ask most often.
A temperature switch opens or closes an electrical contact when temperature crosses a preset setpoint. Unlike a sensor it gives no continuous reading — it is a rugged on/off output used to trigger a warning lamp, relay or protection circuit, often without any ECU.
Need a switch set to your temperature?
We calibrate setpoint and differential to your circuit, with SPST/SPDT contacts across automotive media.
Or visit our contact page for general inquiries.
Related Applications
HVAC Temperature Sensors for Vehicles
Threshold switching for automotive climate control compressor protection.
EV Battery Temperature Monitoring
Critical battery thermal management and over-temperature cut-out for electric vehicles.
Industrial HVAC Sensors
Temperature switches and sensors for industrial climate control systems.
Engine Monitoring Sensors
Coolant and oil temperature switching for engine protection circuits.
Related Products
Temperature Sensors
Continuous NTC thermistors with custom Rt curves for coolant, EGR, HVAC and EV battery thermal management.
Pressure Switches
On/off SPST/SPDT pressure switches with ±3 psi setpoint tolerance for oil-warning and HVAC cut-out.
Pressure Sensors
Continuous ceramic & MEMS pressure sensors with 0.5–4.5 V / 4–20 mA output for closed-loop measurement.
Coolant Level Sensors
Capacitive non-contact coolant level monitoring with ±2 mm accuracy.