Manual On Load Changeover Switch 3KJ 4-pole, for power distribution - 3KJ0238-4AA20-0AA0

Product Description

Siemens Manual On-Load Changeover Switch – 3KJ0 Series – 3KJ0238-4AA20-0AA0

The Siemens 3KJ0238-4AA20-0AA0 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 distribution systems. It is widely used in industrial panels, commercial buildings, and DG backup systems where manual switching between two power sources (mains–generator or mains–mains) is required.

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

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

Key Features:

• Siemens SENTRON / SINOVA 3KJ0 changeover switch 

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

• 4-pole (3P + Neutral) configuration 

• Rated current: 630A (Size 3 frame) 

• AC-23A utilization category for industrial load switching 

• Suitable for mains–generator and mains–mains systems 

• High mechanical endurance and robust rotary mechanism 

• Break-before-make operation ensures safe source transfer 

• Panel mounting with door coupling handle 

• IEC 60947-3 compliant