Siemens Circuit breaker for motor protection, size S0, 82A

Product Overview

The Siemens 3RV2021-1GA15 is a motor protection circuit breaker in size S0 designed for reliable protection and manual switching of three-phase motors. It features a CLASS 10 thermal overload release with an adjustable setting range of 4.5…6.3 A, an instantaneous short-circuit release (N-release) of 82 A, screw terminals for secure wiring, standard switching capacity, and integrated auxiliary contacts (1 NO + 1 NC). This compact device combines overload, short-circuit protection, and motor disconnection in a single unit for industrial motor-control applications.

Key Features

• Motor protection circuit breaker, size S0
• Adjustable overload setting range: 4.5…6.3 A
• CLASS 10 thermal overload characteristic
• Instantaneous short-circuit release (N-release): 82 A
• Built-in auxiliary contacts: 1 NO + 1 NC
• Standard switching capacity suitable for industrial motor circuits
• Screw-type terminals for robust and reliable conductor connection
• Manual ON/OFF/RESET operation
• Compact S0 frame for DIN-rail or panel mounting
• Compatible with Siemens SIRIUS contactors and motor starter combinations

Technical Specifications

• Article Number: 3RV2021-1GA15
• Product Type: Motor protection circuit breaker (manual motor starter)
• Frame Size: S0
• Overload Protection Range: 4.5…6.3 A (adjustable)
• Trip Class: CLASS 10 (thermal)
• Short-Circuit Release: N-release, 82 A
• Main Contacts: 3-pole
• Auxiliary Contacts: 1 NO + 1 NC (integrated)
• Terminal Type: Screw terminals
• Mounting: DIN-rail or panel mounting (S0 standard)
• Functions: Overload protection, short-circuit protection, manual switching, motor disconnection
• Suitable Motor Applications: Three-phase motors matching the 4.5–6.3 A setting range
• Environmental Conditions: Suitable for industrial control panels and motor starter assemblies

Compliance & Standards

• Part of the Siemens SIRIUS 3RV2 motor-protection product family
• Designed in accordance with international motor-protection and circuit-breaker standards
• Engineered for reliable operation under industrial environmental and load conditions

Applications

The Siemens 3RV2021-1GA15 is widely used in motor control centers, machinery control panels, conveyors, pumps, compressors, and automated systems requiring compact and reliable protection for small three-phase motors. It combines switching, protection, and integrated signaling contacts, making it suitable for standalone motor circuits or coordinated motor-starter combinations.