AC Isolator Switch

An AC Isolator Switch, also known as a Disconnector or Isolation Switch, is a safety device designed to completely disconnect an electrical circuit from the main power supply. Its primary function is to ensure a circuit is de-energized for safe maintenance, repair, or installation of connected machinery and equipment. It provides a visible break in the circuit, offering peace of mind that power is off.

While both are safety devices, they serve different purposes:

AC Isolator Switch: Its sole function is isolation. It is a manual, load-breaking switch designed to be operated when the circuit is under no electrical load (i.e., equipment is switched off). It does not provide protection against overloads or short circuits.

Circuit Breaker: Its primary function is automatic protection. It trips to disconnect power in the event of an overload or short-circuit fault. While it can be used as an isolator, a dedicated isolator switch often provides a more robust and visible means of isolation for maintenance.

KRIPAL Isolator Switches are engineered for maximum safety and reliability, featuring:

Clear On/Off Indication: Visually shows the switching status to prevent accidental operation.

Robust Construction: Housings made from high-quality, flame-retardant materials like Polycarbonate (PC) to withstand impact and resist high temperatures.

Secure Lockout/Tagout (LOTO) Capability: Many models feature provisions for padlocks, allowing maintenance personnel to lock the switch in the "OFF" position, preventing accidental re-energisation.

Reliable Load-Breaking Contacts: Designed to safely make and break the rated current.

KRIPAL operates a proven quality management system, with our UKP, UKPN, and UKPW series isolator switches certified by leading international authorities. We hold CE, TÜV, and SEMKO certifications, alongside approvals from major marine classification societies.

This multi-faceted certification guarantees that our products meet the highest international safety standards (IEC 60947-3) and are suitable for use in diverse applications and regions worldwide.

"Finger-safe" protection, as defined by standards like VDE0106, means the design of the terminal covers prevents a standard test finger from making contact with live electrical parts. This is a critical safety feature that significantly reduces the risk of accidental electric shock during installation, inspection, or while the isolator is in operation, ensuring enhanced protection for technicians and operators.

AC Isolator Switches are critical in virtually all industrial and commercial settings:

• Industrial Machinery: For isolating power to CNC machines, conveyor systems, and presses for safe maintenance.
• HVAC Systems: To disconnect power to air handling units, chillers, and pumps.
• Power Distribution Panels: As a main or sub-circuit disconnector in distribution boards.
• Renewable Energy Systems: For isolating solar inverters and battery systems.
• Commercial Buildings: For controlling power to large lighting circuits, water heaters, and other fixed appliances.

These specifications define the switch's capacity and configuration:

Current Rating (e.g., 32A, 63A): The maximum current the switch can safely carry and break. You must select a rating equal to or higher than the circuit it is protecting.

Number of Poles (e.g., 2-Pole, 3-Pole, 4-Pole): This indicates how many separate current-carrying conductors it controls.

• 2-Pole: Controls Line (Live) and Neutral (common for 230V single-phase).
• 3-Pole: Controls three Line conductors (for 400V three-phase without neutral).
• 4-Pole: Controls three Line conductors and the Neutral (for 400V three-phase systems).