Manual On Load Changeover Switch 3KJ 4-pole, for power distribution - 3KJ0240-4AA20-0AA0

Product Description

Siemens SENTRON Manual On-Load Changeover Switch – 3KJ0240-4AA20-0AA0

The Siemens 3KJ0240-4AA20-0AA0 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 commonly used in industrial panels, commercial installations, and DG backup systems for switching between mains–generator or dual mains supply sources.

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 during switching.

It is designed for AC-23A duty, making it suitable for switching motor loads, pumps, HVAC systems, and mixed industrial distribution loads under on-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: 630A (electrihub.com) 

• AC-23A utilization category for industrial load switching 

• Suitable for mains–generator and mains–mains applications 

• Robust rotary handle mechanism with door interlock option 

• Break-before-make operation ensures safe source transfer 

• Panel mounting design for industrial switchboards 

• IEC 60947-3 compliant