HIOKI 3481-20 Non-Contact Voltage Detector | AC 40–600 V, adjustable sensitivity 40–80 V, LED light, CAT IV 600 V

HIOKI 3481-20 Non-Contact Voltage Detector: Adjustable Sensitivity and CAT IV Safety

Overview

The HIOKI 3481-20 is a compact, highly reliable non-contact AC voltage detector designed for safe work by electrical maintenance personnel. Its key feature is adjustable detection sensitivity (40V to 80V), which lets the detection range be tuned to the wiring density on site, avoiding interference from adjacent conductors. Combining a bright LED light with a high safety rating, it is a dependable first check for distribution panels, outlets and power lines.

Key Specifications

Accurate Detection and Sensitivity Control

• Sensitivity adjustment: Maximum sensitivity adjustable from 40V to 80V (80V at shipment), helping isolate the target conductor in dense wiring.
• Non-contact detection: Detects AC voltage without touching bare conductors, reducing the risk of electric shock and speeding up inspection.

Better Working Experience

• LED tip light: A bright LED built into the tip illuminates the test point when working in dim distribution cabinets or ceiling spaces.
• Dual alert: When voltage is detected, the tip lights red and the beeper sounds, giving clear visual and audible alerts.
• Power: LR44 button cell ×3, approx. 5 hours of continuous use, auto power off after 3 minutes.

Industrial Safety and Design

• Safety rating: Complies with CAT IV 600V, providing strong overvoltage protection for demanding industrial power environments.

Source

Specifications per the HIOKI product page and phase detector/voltage detector series catalog (retrieved 2026-10-20).