Siemens 3VA11 Series

Siemens 3VA11 Molded Case Circuit Breaker — Compact Protection for Low-Voltage Distribution

The Siemens 3VA11 series is a comprehensive line of molded case circuit breakers (MCCBs) designed for low-voltage power distribution and motor protection in industrial and commercial applications. With over 4,300 variants spanning frame sizes from 160A to 630A, this series covers the most common protection requirements in panel building, machine building, and infrastructure projects.

What Are 3VA11 Circuit Breakers Used For?

3VA11 MCCBs protect electrical circuits against overload and short-circuit conditions. They serve as the primary protection device in low-voltage switchgear, distribution boards, and motor control centers. Typical applications include:

• Power Distribution: Main and feeder circuit protection in industrial distribution panels, ensuring selective coordination with upstream and downstream devices.
• Motor Protection: Combined with thermal-magnetic trip units, 3VA11 breakers protect motors from overcurrent, phase imbalance, and locked-rotor conditions.
• Building Infrastructure: Feeder protection for HVAC systems, lighting panels, and backup generator circuits in commercial buildings and data centers.
• Machine Building: Individual machine disconnect and protection in automated production lines, packaging equipment, and material handling systems.

Key Selection Parameters

When selecting a 3VA11 breaker, engineers consider these critical specifications:

• Frame Size (Rated Current In): Available in 160A, 250A, 400A, and 630A frames.
• Breaking Capacity (Icu/Ics): Up to 55kA at 400V standard; high-performance variants reach 70kA+.
• Number of Poles: 3-pole and 4-pole configurations; 4-pole for TT and TN-S earthing systems.
• Trip Unit Type: Thermal-magnetic (TM) or electronic (ETU) with optional ground-fault and communication.
• Mounting: Fixed, plug-in, and withdrawable versions available.

3VA11 vs Other 3VA Family Members

• 3VA10 (up to 160A): Compact entry-level MCCB; lower breaking capacity.
• 3VA21/3VA22: Mid-range up to 1000A; up to 150kA breaking capacity; electronic trip units with communication.
• 3VA27: Large frame up to 1600A for main distribution.

Standards and Certifications

IEC 60947-2 compliant. CE marked. UL/CSA certified on selected models. Rated for 690V AC / 500V DC.

Sourcing

Standard 3-pole fixed-mount units typically in distributor stock. Custom trip settings or 4-pole versions: 4-8 weeks. Provide the complete order code (e.g., 3VA1110-3ED32-0AA0) for accurate pricing and availability.