Stelpro 120V-347V Electronic Relay for MIR Series, 15A Features:

• Pulsed signal(PWM) or all nothing (on/off) at 24V, 3-32Vdc signal.
• Compatible with STE241, T822K1034, T87K1015, D010 and ET180 thermostats.
• Two additional relays without transformers can be added to the same control circuit as a relay with a transformer.
• installing more than four relays without transformers to the same thermostat is not recommended.
• Relays must be installed inside the junction box of the heating unit.
• Three year warranty.
• Dimensions: 3.31in (L) x .89in (W) x 2.17in (H).