Manual On Load Changeover Switch 3KJ 4-pole, for power distribution - 3KJ0242-4AA20-0AA0

Product Description

Siemens Manual On-Load Changeover Switch – 3KJ0242-4AA20-0AA0

The Siemens 3KJ0242-4AA20-0AA0 is a SENTRON / SINOVA 3KJ0 series manual on-load changeover switch designed for safe and reliable power source transfer (I–0–II operation) in low-voltage power distribution systems. It is used in industrial switchboards, commercial installations, and DG backup systems to switch between two power sources such as mains–generator or dual mains supply.

This model belongs to the 3KJ0 series (Size 3 frame) and features a 4-pole configuration (3P + Neutral), ensuring complete isolation and safe transfer of all phases and neutral conductors during operation.

It is designed for AC-23A duty, making it suitable for switching motor loads, pumps, HVAC systems, and mixed industrial loads under full load conditions.

Key Features:

• Siemens SENTRON / SINOVA 3KJ0 series changeover switch 

• Manual on-load operation (I–0–II switching) 

• 4-pole (3P + Neutral) configuration 

• Rated current: 400A (reference: Siemens 3KJ0242 series family) 

• AC-23A utilization category for industrial load switching 

• Suitable for mains–generator and mains–mains applications 

• Robust rotary handle mechanism with door coupling option 

• Break-before-make operation ensures safe source transfer 

• Panel mounting design for LT switchboards 

• IEC 60947-3 compliant