TCR9C Series - Littelfuse TCR9C Relays Provide Exceptional Temperature Control

External overview image
Roll Over to Zoom
Disclaimer Notice

Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. "Littelfuse" includes Littelfuse, Inc., and all of its affiliate entities.

The solid-state TCR9C Series Relays are designed for dedicated temperature control of resistive loads. These relays feature a single setpoint controller with high-current, solid-state output. The TCR9C relay is a low-cost, modular approach to accurate temperature control and supports loads up to 20 A. The efficient mounting surface allows for utilization of equipment as the heat sink.

Operation Setpoint Control: TCR9C is a single setpoint temperature controller. When the thermistor resistance is high (above the setpoint), the solid-state output is ON. When the thermistor resistance decreases (temperature increases) to the setpoint or below, the output turns OFF. It should be noted that temperature differential (under and overshoot) is largely due to the system as a whole. The mass of the system, size of the heaters, and sensor all play an important part. Single setpoint control is best when there is little or no lag time between the heater and sensor, and when the heater is not oversized.


  • Temperature control of resistive loads

Access specifications, certifications, check availability and order parts below

Catalog #Input
Voltage (V)
Termination TypeMounting MethodWeight (lbs/g)Control TypeDielectric BreakdownHumidityInput AC Line Frequency (Hz)Input Tolerance (%)Open State Leakage Current (A)Minimum Output Load Current (A)Output Load Rating (VA)Output TypeOutput Voltage Drop (V)StockSamples
TCR9C120 - 240 VacNon-isolated single pole zero voltage switching0.25 in. (6.3 mm) male quick connect terminalsSurface mount with one #10 (M5 x 0.8) screw0 KgSingle setpoint; negative temperature coefficient resistance sensing≥2000 terminals to mounting surface95% non-condensing50 / 60±15%≅5 @230 Vac100Steady state: 20 A; Inrush: 200 ASolid state≅2.0 at rated currentCheckOrder
To request product environmental information, please complete the Product Environmental Information Request Form.