Siemens SENTRON 3VA2225-5KQ42-0AA0 Molded Case Circuit Breaker Product Description

Overview

Siemens SENTRON 3VA2225-5KQ42-0AA0 is a 3VA2 series electronic molded case circuit breaker (MCCB), frame 250 A, M breaking capacity grade, 4-pole configuration, fitted with ETU860 LSIG electronic trip unit. This Siemens breaker is designed for low‑voltage AC distribution, transformer secondary and important feeder selective protection, supporting electrical measurement, neutral adjustable protection and communication expansion. 3VA2225-5KQ42-0AA0 is widely used for new switchgear construction, power distribution renovation and spare‑part replacement of SENTRON 3VA2 MCCB systems.

Features

Siemens 3VA2225-5KQ42-0AA0 adopts optimized arc extinguishing structure for reliable interruption of short-circuit faults. This ETU860 trip unit supports full LSIG protection: long-time overload, short-time delay, instantaneous short-circuit and earth fault protection. 3VA2225-5KQ42-0AA0 integrates built‑in current transformers, can measure three‑phase V, I, P, Q, energy and power factor, with adjustable neutral conductor protection. It supports optional motor operator, shunt release, undervoltage release, auxiliary and alarm contacts for remote control and status feedback. Communication modules can be added to transmit measurement data and fault records to SCADA and energy management platforms. It complies with IEC 60947‑2 and carries CCC, CE, UKCA certifications.

Specs

• Brand: Siemens

• Series: SENTRON 3VA2

• Model: 3VA2225-5KQ42-0AA0

• Frame rated current: 250 A

• In adjustable range: 100–250 A

• Breaking grade: M

• Icu (415 V AC): 55 kA

• Rated operational voltage Ue: Up to 690 V AC

• Poles: 4P

• Trip unit: ETU860, LSIG protection

• Terminal type: Front bolt terminal

• Protection: L, S, I, G earth fault

• Mechanical life: 25000 operations

• Standard: IEC 60947‑2, CCC, CE, UKCA

Principle

Siemens 3VA2225-5KQ42-0AA0 samples current signals from built‑in CTs and sends data to the ETU860 electronic trip unit. The protection chip compares real-time values with configured thresholds. Overload triggers long‑time delayed trip; selective short‑circuit triggers short‑time delay trip; heavy short‑circuit triggers instantaneous trip; earth leakage over-limit triggers earth fault trip. The arc chamber rapidly elongates and cools the arc to isolate the fault circuit. Auxiliary contacts synchronously output breaker closing, opening and tripping status signals.

Applications

Siemens 3VA2225-5KQ42-0AA0 is deployed in factory main distribution rooms, commercial buildings, water treatment plants and infrastructure low‑voltage switchboards. This MCCB protects transformer outgoing feeders, bus sections and important distribution loads. 3VA2225-5KQ42-0AA0 fits switchgear upgrade and spare replacement of SENTRON 3VA2 series electronic molded case breakers.

Installation & Maintenance Notes

Follow official Siemens 3VA2 hardware manual during installation of 3VA2225-5KQ42-0AA0. Torque cable terminals to specified torque value to avoid overheating. Back up all protection curves and communication parameters before replacement. After replacement, perform protection test and communication verification. Check terminal tightness, heat dissipation and cabinet cleanliness regularly. Confirm exact part number 3VA2225-5KQ42-0AA0, pole count and ETU860 trip version before spare‑part swap‑out.