Nsi Industries A512HW In-wall Spring Wound Timer 12 Hour

Product Description

The NSI INDUSTRIES A512HW is a spring-wound, in-wall interval timer designed for residential and light commercial switching applications. It operates on a 12-hour time cycle with a variable twist-knob for setting time-on durations ranging from 15 minutes up to 12 hours depending on the model. This unit ships in a Without Hold configuration, meaning there is no constant-on position. Rated at 20 amps at 125 VAC (resistive/inductive) and 10 amps at 250/277 VAC (resistive/inductive), it handles a broad range of load types including motor and tungsten loads. Electricians and electrical contractors install this device in a standard in-wall box as a direct replacement for conventional toggle or rotary switches.

The A512HW is suited for controlling whole house fans, bathroom exhaust fans and lights, indoor and outdoor lighting circuits, and self-storage facility lighting. Its wall-mount form factor drops into a standard single-gang electrical box, making it a practical fit for new construction and retrofit jobs alike. The simple twist-knob design requires no programming or adjustment — wire it in and the timer is operational. It carries UL approval for both Canada and the United States, making it acceptable for permitted electrical work in either market.

Key Features

• 12-hour spring-wound time cycle with variable twist-knob setting from 15 minutes up to 12 hours
• Without Hold operation — no constant-on position on this model
• SPDT and SPST switch configurations supported
• Rated 20 amps at 125 VAC and 10 amps at 250/277 VAC (resistive/inductive loads); 7 amps at 125 VAC for tungsten loads
• Motor load rated: 1 HP at 125 VAC, 2 HP at 250 VAC
• UL listed for Canada and the United States
• White color finish; standard in-wall mounting with no special tools or adjustments required

Compatibility

Designed as an OEM-style in-wall spring-wound timer replacement for standard single-gang wall switch applications including whole house fans, bathroom fans and lights, indoor and outdoor lighting, and self-storage lighting controls.

Installation Notes

Installation should be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and all applicable local codes. Shut off circuit power at the breaker panel and verify the circuit is de-energized with a non-contact voltage tester before wiring. The device mounts in a standard single-gang in-wall electrical box. Do not exceed the rated amperage or voltage for the load type being controlled.

Technical Specifications

• Time Cycle: 12 hours
• Operation Type: Without Hold
• Switch Type: SPDT, SPST
• Contact Current Rating: 20 amps at 125 VAC 50/60 Hz (Resistive/Inductive); 10 amps at 250/277 VAC 50/60 Hz (Resistive/Inductive); 7 amps at 125 VAC 50/60 Hz (Tungsten)
• Contact Power Rating: 1 HP at 125 VAC; 2 HP at 250 VAC (Motor)
• Operating Temperature: 32 to 122 degrees F
• Mounting: Wall
• Color: White
• Height: 2.706 inches
• Length: 1.41 inches
• Width: 1.745 inches
• Package Weight: 0.4 pounds
• Approval: UL (Canada and US)
• Country of Origin: China

Standard Information

• Brand: NSI INDUSTRIES
• Manufacturer Part Number: A512HW