HIOKI L9788-10 Remote Switch Test Lead | LED light, PASS/FAIL red/green indicator, 1.2 m long, CAT III 600 V, for IR4056／IR4057-50／IR4059

HIOKI (Japan) L9788-10 Remote Switch Test Lead: Insulation Tester Probe with Lighting and Remote Measurement

Overview

In high-voltage panel maintenance, solar PV system acceptance and motor insulation testing, insulation resistance testing often requires holding the probes firmly with both hands to ensure accurate contact. Conventional testing forces the engineer to free one hand to press the test switch on the main unit, which is inconvenient and increases the risk of a slip and electric shock. The genuine authorized HIOKI (Japan) product L9788-10 remote test lead (test lead with switch) is an accessory designed to improve the safety of insulation testing and the efficiency of one-person work.

The set builds a durable push-button test switch and a bright LED light directly into the handheld probe. When working inside dark, cramped switch boxes or cabinets, the engineer can turn on the light and trigger the high-voltage test with one hand on the probe, and confirm the PASS/FAIL insulation result immediately via the red/green judgment indicator on the probe handle, keeping eyes on the target and hands on the probe throughout the inspection.

Key Technical Specifications

Remote Switch and Handle LED Indicators

• High-voltage trigger switch integrated into the handle: Without touching the insulation tester, pressing the switch on the probe applies the high-voltage test current immediately and releasing it stops the test, making one-person operation smoother and safer.
• Bright white LED work light: A bright LED built into the probe tip lights up dark distribution boxes and terminal block corners at the press of a button, with no need to hold a separate flashlight.
• Red／green judgment indicator on the handle: When the main unit has a comparator function, the indicator lights green for pass and red for fail, so there is no need to look back at the main unit display.

Industrial-Grade Protection

• Highly insulated cable: Flexible, abrasion-resistant, highly insulated genuine HIOKI wire withstands the high-voltage pulses from megohmmeters to ensure operator safety.
• Replaceable tip: When the tip wears, it can be replaced individually with replacement tip L9788-90.

Compatible Models

• Compatible with HIOKI insulation resistance testers (megohmmeters):
• Insulation resistance testers: IR4056-20／IR4056-21, IR4057-50, IR4059 (standard). The L9788-11 is a set of the L9788-10 plus a black ground lead (alligator clip).
• PV insulation tester: IR4053-10.

Applications

• Insulation testing of high- and low-voltage panels and transformers: One-person checks of phase-to-phase and phase-to-ground insulation resistance.
• Solar PV plant and inverter acceptance: Quick spot checks of high-voltage insulation resistance on PV arrays.
• Preventive maintenance of motors and electromechanical equipment: Winding-to-ground insulation tests with the result confirmed immediately by the handle indicator.