Surge Arrester Apator ASA 500-10BO+K with Disconnector, MPN 63-823219-061

Apator ASA 500-10BO+K is a surge arrester with an integrated disconnector designed to protect electrical installations and sensitive equipment from transient overvoltages. The device functions as a surge protective device (SPD) that diverts surge current away from the protected circuit and, at the end of its service life, isolates itself through the built-in disconnector to allow safe replacement and maintenance without exposing personnel or the installation to hazardous conditions.

Advantages

The unit combines surge suppression and a mechanical disconnector in a single compact module, reducing the need for additional isolation devices and simplifying installation in distribution boards. Its construction is intended to provide reliable shunting of surge currents while signalling end-of-life by opening the circuit, which supports safer maintenance procedures. The product is suitable for DIN-rail mounting and integration in building electrical systems where overvoltage protection is required.

Suitable for

• Protection of distribution boards and consumer units in residential and commercial buildings
• Safeguarding sensitive electronic equipment such as PLCs, communication devices, and control systems
• Use in TN and TT earthing systems where transient overvoltage protection is necessary
• Installation in new or retrofitted electrical panels that accommodate modular surge protective devices

When it may not be suitable

This surge arrester is intended for protection against transient overvoltages and is not a substitute for continuous overcurrent or ground-fault protection devices. It may not be suitable for installations that require a different level of protection coordination or higher continuous current ratings than the module provides. For systems with atypical earthing arrangements or where specific certifications are mandated, verify compatibility before selection.

Key specifications

• Function: Surge protective device with integrated disconnector
• Application: Protection of low-voltage electrical installations and equipment
• Mounting: Module suitable for DIN-rail installation in distribution boards
• Operation: Diverts surge current and provides mechanical isolation at end-of-life
• Typical use environment: Residential, commercial, and light industrial electrical panels

How to use

Install the surge arrester in the distribution board on the designated DIN rail position, connecting the line and neutral (or phase and earth, depending on system configuration) according to the electrical design and local wiring regulations. Ensure the device is located near the main incoming supply or the circuit branch being protected to minimize lead lengths. After installation, periodically inspect the device status indicator or test point where provided and plan replacement when the disconnector indicates end-of-life to maintain continuous protection.

What to consider before purchase

• Verify compatibility with the local earthing system (TN, TT, or IT) and the circuit arrangement where the SPD will be installed
• Confirm physical dimensions and DIN-rail space available in the distribution board
• Check coordination requirements with upstream and downstream protection devices to ensure selective operation
• Review environmental and temperature conditions of the installation location

Usage recommendations

For effective surge protection, position the surge arrester as close as possible to the supply entry point and keep connection leads short and straight. Replace the device promptly when the disconnector operates or when periodic inspection indicates degradation to ensure ongoing protection of downstream equipment.