Siemens 3RV2021-4NA10 - Circuit Breaker | AmpState

Siemens 3RV2021-4NA10 molded case circuit breaker from AmpState delivers dependable branch circuit overcurrent and short-circuit protection right where you need it—in panelboards and loadcenters. With a compact, space-efficient design and Siemens engineering at its core, this breaker keeps your electrical system safe without crowding your panel.

• Compact molded-case design maximizes panel space, making installation tidy and straightforward while leaving room for future circuits.
• Thermal-magnetic trip unit delivers stable, repeatable protection across a range of loads and conditions, reducing nuisance trips while remaining fast to interrupt when faults occur.
• OEM-compatible compatibility designed to fit seamlessly with matching Siemens loadcenters and panelboards, simplifying replacements and upgrades.
• Ideal for multiple settings suitable for residential, commercial, and light industrial applications where reliable branch-circuit protection is essential.

In practice, this 3RV2021-4NA10 breaker helps you maintain safe, reliable power distribution as you expand or upgrade panels. It protects wiring and devices on individual branches, supports quick fault isolation, and minimizes downtime by providing predictable, protected tripping behavior when overloads or short circuits occur.

• : upgrading existing Siemens panels, adding protection for new circuits in homes or small offices, and replacing worn or outdated breakers to restore dependable operation.
• : electricians, facility managers, and DIY enthusiasts tackling panel maintenance in residential, commercial, or light industrial environments.
• : verify that the panelboard is compatible with the Siemens OEM lineup, observe proper wiring practices, and ensure the line/load orientation matches the panel’s design.

Technical snapshot

• Manufacturer: Siemens
• Part Number: 3RV2021-4NA10
• Type: Thermal-magnetic molded case circuit breaker
• Application: Branch circuit overcurrent and short-circuit protection
• Compatibility: Matching OEM loadcenters and panelboards