SIEMENS 3WT9853-1JK00 F3 Undervoltage Release, 220-240VAC / 220-250VDC

Overview

The SIEMENS 3WT9853-1JK00 is an F3 undervoltage release accessory for Siemens SENTRON 3WT8 air circuit breakers. It prevents breaker closing and triggers trip when control voltage drops, widely stocked as spare for main switchgear and power distribution systems.

Features

This YU release is dedicated for 3WT8 ACB frames. The 3WT9853-1JK00 only holds the latch mechanism when voltage stays above the minimum threshold, with built-in surge suppression and adjustable short delay. It can be fitted inside the breaker chamber and replaced separately.

Specs

Model: 3WT9853-1JK00 Series: SENTRON 3WT8 accessories Type: undervoltage release Rated voltage: 220–240V AC / 220–250V DC Applicable breaker: 3WT8 air circuit breaker Mounting: internal fit inside ACB Protection class: IP20 Certifications: CE, IEC 60947-2 Product status: switchgear spare

Principle

The internal spring mechanism remains blocked only under valid supply voltage. If voltage fails or falls below the threshold, the trip unit releases the latch, trips the breaker and blocks reclosure until voltage recovers.

Applications

The 3WT9853-1JK00 is widely deployed in industrial main switchrooms, power plants and refinery distribution skids. It provides voltage-loss interlock protection for Siemens 3WT8 air circuit breakers.