SIEMENS 3WT9841-0JC00 Product Description

Overview

SIEMENS 3WT9841-0JC00 is an undervoltage release accessory for the SIEMENS SENTRON 3WT air circuit breaker series. It trips the air breaker automatically when the control supply voltage drops below the defined threshold, preventing equipment damage caused by low-voltage or power recovery surge. It is an official OEM spare part for 3WT ACB maintenance and retrofit in low-voltage switchgear.

Features

SIEMENS 3WT9841-0JC00 is designed for AC voltage actuation. It provides reliable undervoltage protection and will block the breaker closing operation if the supply voltage is insufficient. The release is equipped with built-in time delay option to avoid nuisance tripping from transient voltage dips. It mounts directly inside the 3WT breaker mechanism compartment and matches the original mechanical trip linkage. It is fitted with diagnostic status indicators and meets IEC 60947-2 standard for air circuit breaker accessories. It can be combined with shunt trip coils, auxiliary switches and motor operators for complete breaker control logic.

Specs

Brand: SIEMENS Model: 3WT9841-0JC00 Product series: SENTRON 3WT Product category: Undervoltage release (UVR) for 3WT ACB Compatibility: 3WT air circuit breaker Standard: IEC 60947-2 Mounting: Internal mechanism installation Protection: IP20

Principle

SIEMENS 3WT9841-0JC00 holds the trip latch magnetically under normal rated voltage. When the supply voltage falls below the release threshold, the magnetic force is insufficient and the spring drives the trip mechanism to open the air circuit breaker. The breaker cannot be closed again until the voltage recovers to the acceptable range and manual reset is performed. This protects downstream motors, transformers and sensitive loads from unstable low voltage.

Applications

SIEMENS 3WT9841-0JC00 is used for power distribution undervoltage protection. Typical applications include factory main switchboards, MCC rooms, power plant auxiliary systems, data center incoming feeders, and spare replacement for existing SENTRON 3WT air breaker switchgear.