WR-4040-120 is a transformer with 40VA steady and pulsed draw that supply the switching for Douglas 2-wire relay control. 2-wire relays are latching type and only require power to switch on or off. One transformer is suficient to service many relays and devices. Current limiting and internally fused with a one time event fuse.
| Brand Name | Douglas Lighting Controls | Item Name | Control Transformer |
| Type | Light Duty, Current Limiting, Class-2 | Primary Voltage | 120 V |
| Secondary Voltage | 24 VAC | VA Rating | 40 VA |
| Series/Model | WR-4040 | Connection Type | 6 in Wire |
| Dimensions | 2.38 in W x 2.87 in D x 2 in H | Temperature Rating | -20 to 120 °F |
| Standards | UL Listed, CSA Certified |
| 1 - UNIT - 1 | 10 - UNIT - 10 |
