Manual On Load Changeover Switch 3KJ 4-pole, for power distribution - 3KJ1126-4AA20-0AA0

Product Description

Siemens SENTRON Manual On-Load Changeover Switch – 3KJ1126-4AA20-0AA0

The Siemens 3KJ1126-4AA20-0AA0 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 panels, commercial buildings, and DG backup systems for switching between two independent power sources such as mains–generator or dual mains supply.

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

It is designed for AC-23A duty, making it suitable for switching inductive and mixed industrial loads such as motors, pumps, HVAC systems, and feeder distribution circuits under full load conditions.

Based on the 3KJ0 size 3 platform characteristics, this variant typically falls in the 400A class of manual changeover switches, suitable for medium-to-heavy industrial LT distribution systems.

Key Features:

• Siemens SENTRON / SINOVA 3KJ0 series changeover switch 

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

• 4-pole (3P + Neutral) configuration 

• Rated current: 400 A (typical for Size 3 frame family) 

• AC-23A utilization category for industrial load switching 

• Suitable for mains–generator and mains–mains applications 

• Break-before-make mechanism for safe source transfer 

• Robust rotary handle operation 

• Panel mounting design for LT switchboards 

• IEC 60947-3 compliant