Siemens 3WX3141‑3JC02 Solid State Overcurrent Release Product Description

Overview

Siemens 3WX3141‑3JC02 is an electronic solid‑state overcurrent release designed for the Siemens 3WN1 / 3WN5 and 3WS1 low‑voltage air circuit breakers. This Siemens solid‑state trip unit provides multi‑adjustable protection curves for low‑voltage main distribution and motor feed circuits. 3WX3141‑3JC02 is a legacy electronic release, widely used for panel renovation and spare‑part replacement of old 3WN / 3WS breaker frames in industrial power systems.

Features

Siemens 3WX3141‑3JC02 solid‑state overcurrent release supports adjustable long‑time overload, short‑time delay and instantaneous short‑circuit protection functions. This Siemens electronic trip unit can be configured for distribution or motor protection characteristics according to project requirements. 3WX3141‑3JC02 integrates current measurement circuits and logic processing, and receives current signals from the breaker built‑in current transformers. The Siemens solid‑state release provides trip test interfaces for on‑site function verification without primary current injection. This release supports optional earth‑fault protection extension and status alarm output for remote monitoring.

Specs

Siemens 3WX3141‑3JC02 solid state overcurrent release

• Brand: Siemens

• Model: 3WX3141‑3JC02

• Compatible breaker: 3WN1, 3WN5, 3WS1 air circuit breaker

• Type: Electronic solid‑state trip unit

• Protection functions: Long‑time overload, short‑time delay, instantaneous short‑circuit

• Signal source: Breaker internal CTs

• Mounting: Built‑in installation inside the ACB frame

• Ambient: Indoor switchgear cabinet environment

Principle

Siemens 3WX3141‑3JC02 solid‑state overcurrent release samples secondary current signals from the breaker current transformers. The internal electronic circuit calculates the actual current value and compares it with the set protection thresholds. If overload lasts beyond the set time, the release sends a trip command to the breaker operating mechanism. In the event of severe short‑circuit current, the instantaneous function triggers an immediate trip. When earth‑fault option is fitted, residual current is calculated and earth‑fault trip can be activated.

Applications

Siemens 3WX3141‑3JC02 solid‑state overcurrent release is deployed in factory main distribution rooms, power plant auxiliary power cabinets and large‑scale MCC switchboards equipped with 3WN / 3WS air breakers. This Siemens trip unit serves as the protection core for transformer feeders, large motor circuits and bus tie breakers. 3WX3141‑3JC02 fits power panel overhaul and spare replacement of legacy 3WN series ACB protection units.

Installation & Maintenance Notes

Follow official Siemens 3WN / 3WS service manuals during installation of Siemens 3WX3141‑3JC02 solid‑state overcurrent release. Confirm CT wiring polarity and trip parameter settings after replacement. Back up all protection setpoints before removing the old release. Perform trip simulation test after installation to verify protection logic. Check cabinet temperature and avoid excessive heat affecting electronic component accuracy. Confirm exact part number 3WX3141‑3JC02 before spare‑part swap‑out to match the breaker frame size and CT ratio.