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Solid State Relay Without Transformer


120 Vac TRIAC, solid-state heating relay without transformer

  • Product Info
  • Literature


Compatible with Vac or Vdc signals, the RT850 enables unparalleled temperature precision in complete silence


  • Enables superior temperature control when used with 15-second cycle thermostats
  • Dual input: Compatible with a 24 Vac or 4-32 Vdc signal
  • Compatible with all 24 V thermostats with 2-wire connections (R,W) or 3-wire connections (R,W,C)
  • Heating command indicator light gives as-a-glance verification of relay operation
  • Simple installation in standard 4 in. x 4 in. electrical box
  • Terminal board connection enables easy installation

Product Specifications

Control a line voltage resistive load from a 24 Vac control signal or from signal sources of 4 to 32 VDC.
Dimensions (in.)
4-7/32 in. wide x 4-7/32 in. high x 1-29/32 in. deep
Dimensions (mm)
107 mm wide x 107 mm high x 48 mm deep
Used With
T114-A-024T-15S; TH115-A-024T-15S; TH150 Series
100% Silent; Compatible with all 24 V thermostats with 2-wire connections (R, W) or 3-wire connections (R, W, C)
Item Type
50 Hz; 60 Hz
Approvals, Underwriters Laboratories Inc.
Operating Humidity Range (% RH)
0 to 95% RH, non-condensing
Temperature Ratings (C)
-20 C to 60 C
Temperature Ratings (F)
-4 F to 140 F
Shipping and Storage Temperature Range (F)
-40 F to 175 F
Shipping and Storage Temperature Range (C)
-40 C to 80 C
Approvals, Canadian Underwriters Laboratories Inc.
Weight (oz)
15.3 oz
Weight (g)
434 g
Input Voltage
120 Vac; 208 Vac; 240 Vac; 277 Vac
Control Signal
AC: 24V/32 mA; DC: 4 to 32V/16 mA
23 A @ 120/208/240/277/347 Vac
Terminal Wire size
12 AWG