Southwire 40150N Dual Range Non-contact Ac Voltage Detector

Product Description

The SOUTHWIRE 40150N is a dual-range, non-contact AC voltage detector built for electrical diagnostics in residential, commercial, and industrial settings. It detects live voltage without requiring direct contact with a conductor, reducing exposure risk during live-circuit testing. The unit covers two detection ranges: 100 to 1,000 VAC for standard line-voltage work and 12 to 1,000 VAC for low-voltage applications. At 6.5 inches in length and 1 inch in width, it fits easily in a tool pouch or chest pocket. Power comes from two AAA 1.5V batteries. Licensed electricians, HVAC technicians, and maintenance professionals rely on non-contact voltage testers as a first-check safety tool before touching any conductor or terminal.

This detector suits a wide range of electrical work, including panel inspection, outlet and switch testing, junction box verification, and low-voltage circuit checks. The 12 to 1,000 VAC lower range makes it useful for doorbell transformers, thermostat wiring, and other low-voltage control circuits in addition to standard 120V and 240V branch circuits. The advanced dual-range capability means a single tool covers both control-voltage and line-voltage environments without swapping instruments.

Key Features

• Dual detection ranges: 12 to 1,000 VAC and 100 to 1,000 VAC for broad application coverage
• Non-contact sensing eliminates the need to touch live conductors during voltage verification
• Compact form factor at 6.5 inches tall and 1 inch wide fits standard tool pouches
• Powered by 2 AAA 1.5V batteries for field-ready portability
• Suitable for both low-voltage control circuits and full line-voltage systems

Compatibility

Designed for general-purpose AC voltage detection across residential, light commercial, and industrial electrical systems operating within the 12 to 1,000 VAC range.

Installation Notes

Non-contact voltage testers are used by licensed electricians and qualified technicians as a preliminary safety check before servicing electrical circuits. Always de-energize and lock out or tag out circuits per OSHA and NEC guidelines before performing hands-on work, even after a no-voltage indication. Verify the tester is functioning correctly by testing it on a known live source before and after each use. Battery replacement should be performed with the unit away from any energized equipment.