Manual On Load Changeover Switch 3KJ 4-pole, for power distribution - 3KJ1130-4AA20-0AA0

Product Description

Siemens SENTRON Manual On-Load Changeover Switch – 3KJ1130-4AA20-0AA0

The Siemens 3KJ1130-4AA20-0AA0 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 electrical distribution systems. It is used in industrial plants, commercial buildings, and DG backup systems to switch between two independent power sources such as mains–generator or dual mains incomer systems.

This model belongs to the 3KJ0 Size 2/3 family (depending on configuration variant) and features a 4-pole (3P + Neutral) switching system, ensuring complete isolation of all phases and neutral during changeover. The mechanism is designed for break-before-make operation, preventing any possibility of short-circuit between two power sources.

It is suitable for AC-23A duty, meaning it can safely handle inductive loads such as motors, pumps, compressors, and HVAC systems under full-load switching conditions. The design is rugged and intended for reliable manual operation in LT panel boards.

Based on Siemens 3KJ0 platform structure and similar variants in this range, this model is typically used in the 250A class changeover applications, making it suitable for medium industrial and commercial power 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: ~250 A (platform-based variant) 

• AC-23A utilization category for industrial loads 

• Suitable for mains–generator and mains–mains transfer systems 

• Break-before-make mechanism for safe switching 

• Robust rotary handle operation 

• Panel mounting design for LT switchboards 

• IEC 60947-3 compliant