Overview
The Siemens 3RV1021-1HA10 is a compact motor protection circuit breaker from the SIRIUS Innovation line, engineered for reliable motor control in industrial automation and manufacturing environments. Rated 5.5–8A at 690VAC with 3kW capacity, this Class 10 unit provides both thermal overload and magnetic short-circuit protection. The adjustable rotary dial allows field personnel to set motor full-load amperage (FLA) precisely, reducing nuisance trips while protecting equipment from damage.
Key Features
- Adjustable thermal overload protection with on/off rotary FLA dial
- Magnetic trip elements for Class 10 short-circuit protection
- Rated short-circuit proof to 50kA @ 400VAC (standard switching capacity)
- Rated operational voltage: 220–690VAC (flexible voltage range)
- DIN rail mounting for space-efficient panel installation
- Manual reset with lockable off position for safety compliance
- Size S0 compact footprint; mechanical life rated to 105 operations
Technical Specifications
- Adjustable current range: 5.5–8A
- Rated thermal current (A-rel): 5.5–8A
- Rated magnetic current (N-rel): 104A
- Rated operational voltage: 220–690VAC
- Maximum rated current (short-circuit capacity): 100A
- Short-circuit proof rating: 50kA @ 400VAC
- Motor power at 400VAC: 3kW
- Protection class: Class 10
- Terminal type: Screw terminal
- Switching frequency: Max 15 operations/hour
- Mechanical life: 105 operations
- Ambient temperature range: –20 to +60°C
- Mounting: DIN rail
- Weight: 0.75 lbs (0.34 kg)
- Size category: S0
Typical Applications
- Industrial motor starter protection in variable frequency drive (VFD) and soft-start circuits
- Factory automation machinery and conveyor systems
- HVAC compressor and pump motor control
- Machine tool and CNC equipment motor protection
- General-purpose industrial motor circuits up to 3kW (400V)
- Panel-mounted motor control centers (MCCs) and electrical distribution boards
Compatibility & Replacements
Compatible With
- Siemens SIRIUS motor starter contactors (3RT, 3RK series)
- Siemens soft-start units and VFD motor control circuits
- Standard three-phase 400VAC, 690VAC industrial networks
- DIN rail-mount motor control panels and electrical enclosures
- Siemens SIRIUS control relay modules and auxiliary contact blocks
Replaces / Drop-In Replacement For
- Earlier Siemens 3RV10 series motor protection devices (same footprint and screw-terminal connection)
- Generic three-pole motor circuit breakers in Size S0 with comparable 5.5–8A thermal ratings
Works With
- Siemens SIRIUS components: contactors, overload relays, and auxiliary relays
- Standard 690VAC three-phase industrial electrical systems
- Screw-terminal wiring (copper and aluminum conductors)
- Soft-start and VFD motor control schemes at rated voltage
- Note: This unit is a standalone circuit breaker; verify compatibility with your system integrator or controls engineer before ordering to ensure proper coordination with upstream overcurrent protection and load requirements.
