SIRIUS 3RV1021-0JA10-ZW98 — Motor-Protective Circuit Breaker, 1 A, Class 10
The Siemens 3RV1021-0JA10-ZW98 is a SIRIUS motor-protective circuit breaker designed for 3-phase motor branch circuits, rated 1 A continuous current with Class 10 trip characteristic — meaning it clears an overload within 10 seconds at 7.2× rated current, matching the thermal time constant of standard induction motors up to 0.25 kW at 400 V. Breaking capacity reaches 100 kA across the full voltage range (240 V through 690 V AC), so it can interrupt worst-case fault currents without upstream coordination — a rare spec for a 45 mm wide device. Built-in phase-failure detection trips the breaker if one phase drops out, preventing single-phasing damage to the motor. No ground-fault detection on this variant.
Panel Integration & Mounting
Mounting position any; no derating for side-by-side placement (0 mm clearance required at sides and rear). Screw-type terminals on both main and auxiliary circuits accept solid or stranded conductors: 2×(1…2.5 mm²) and 2×(2.5…6 mm²) per clamp, or AWG 14–10.
RoHS compliance date 01.05.2012 confirms the part meets EU substance restrictions. Ambient operating range -20…+60 °C; storage/transport -50…+80 °C.
Duty Cycle & Thermal Management
Maximum operating frequency in AC-3 duty is 15 operations per hour — adequate for motor starting on pumps, fans, and compressors, but not for high-cycling applications like rapid reversing. Power dissipation at rated current: 7.25 W total, 2.4 W per pole in hot operating state. Rated impulse withstand voltage 6 kV, shock resistance 25 g / 11 ms — suitable for industrial environments with transient surges and mechanical vibration.