Siemens 3RV2021-4CA10 - Circuit Breaker | AmpState

Meet the Siemens 3RV2021-4CA10 molded case circuit breaker—a compact, reliable solution built to shield your electrical system from overcurrent and short-circuit events. Designed to fit seamlessly in panelboards and loadcenters, this unit keeps wiring tidy and panel real estate in check while delivering dependable protection for everyday power needs.

• Space-efficient molded case design minimizes bulky hardware and frees up valuable panel space for easier routing and future expansions.
• Thermal-magnetic trip unit provides stable, repeatable protection with fast response to short circuits, and coordinated operation with upstream devices to reduce nuisance trips.
• OEM panel compatibility engineered to work with matching Siemens panelboards and loadcenters, ensuring proper fit, whisker-free mounting, and reliable protection coordination.
• Versatile application ideal for residential, commercial, and light industrial environments where dependable branch-circuit protection is essential.

Technical Details

• Manufacturer: Siemens
• Part Number: 3RV2021-4CA10
• Type: Thermal-magnetic molded case circuit breaker
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases

• Residential panelboards where space efficiency and reliable protection matter for lighting, outlets, and appliance circuits
• Small commercial panels handling lighting, HVAC controls, and office equipment
• Light industrial panels where durable protection and OEM compatibility streamline maintenance and replacements

Why choose the 3RV2021-4CA10

This breaker isn’t just a drop-in part; it’s a purpose-built solution from Siemens that aligns with your existing OEM loadcenters for consistent trip characteristics, predictable performance, and long-term reliability. Its compact design preserves panel capacity, while the thermal-magnetic trip unit delivers precise protection across varying loads, temperatures, and wiring configurations—giving you peace of mind in daily operations.

Practical tips for best results

• Verify panelboard compatibility with Siemens OEM data before installation to ensure optimal fit and protection coordination.
• Follow standard electrical safety practices: de-energize equipment, use the correct torque on terminal connections, and consult the official installation instructions for your panel model.
• When ordering, confirm the exact trip characteristics and interrupting rating required for your circuits to maintain safe and code-compliant protection.