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Sizing the Heating Circuit
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24V Mechanical Transformer Relay
Product Type: Mechanical Heat Relay with 24V Transformer
Control Voltage: 24 VAC
Line Voltage Models: 120 V, 208 V or 240 V
Resistive Rating: 25 A at 120/240 V; 22 A at 208 V
Switch Action: SPST or SPST Dual Circuit
Thermostat Compatibility: Two-Wire Low-Voltage Thermostats
Models: 24A01G-3, 24A05A-1, 24A05E-1, 24A06G-1
Warranty: 1-Year Limited Warranty
Mechanical transformer relay for operating line-voltage electric heat from low-voltage thermostat control.
The mechanical transformer relay is designed to operate with low-voltage thermostat systems. Two or more Level-Temp silent operators can be operated by one two-wire low-voltage thermostat.
Models are available for 120V, 208V and 240V line voltage applications, including a 240V dual-circuit model.
| MODEL | DESCRIPTION | Voltage | Control Voltage | Resistive Rating | Switch Action | WT. (lbs.) |
|---|---|---|---|---|---|---|
| 24A01G-3 | Mechanical Heat Relay With a 24V-240V Transformer | 240V | 24V | 25A | SPST | 0.5 |
| 24A05A-1 | Mechanical Heat Relay With a 24V-120V Transformer | 120V | 24V | 25A | SPST | 0.5 |
| 24A05E-1 | Mechanical Heat Relay With a 24V-208V Transformer | 208V | 24V | 22A | SPST | 0.5 |
| 24A06G-1 | Mechanical Heat Relay With a 24V-240V Transformer - Dual Circuit | 240V | 24V | 25A | SPST - Dual Circuit | 0.5 |
Furnish and install King Electric mechanical transformer relay where indicated to interface a two-wire low-voltage thermostat with line-voltage electric heating equipment. Relay shall include 24 VAC control and shall be selected for line voltage and resistive rating required by the application.

Locking Thermostat Guard are designed for offices, restaurants and public areas to prevent adjustment of the temperature by unauthorized personnel. Durable construction.
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Designed for single pole applications. Compatible with 24V thermostats with 2-wire connections (R,W) or 3-wire connections (R,W,C). Immediate relay activation provides improved temperature control and comfort.
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Designed to operate with low-voltage systems. Two or more Level-Temp Silent Operators can be operated by one two-wire low-voltage thermostat.
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Locking Thermostat Guard are designed for offices, restaurants and public areas to prevent adjustment of the temperature by unauthorized personnel. Durable construction.
View Products