Siemens Circuit breaker for system protection, size S3, screw, 70A Part number 3RV2742-5QD10

Product Overview

The Siemens 3RV2742-5QD10 is a SIRIUS 3RV2 series circuit breaker (size S3) designed for system protection in industrial applications. Rated for 70 A, it offers high breaking capacity and robust performance, making it suitable for main and emergency off switching, feeder protection and general system protection duties.

Key Features

• Size S3 circuit breaker in the SIRIUS 3RV2 family
• Rated operational current: 70 A
• Rated for system protection with UL 489 / CSA C22.2 No. 5 approval
• High short-circuit breaking capacity: up to 100 kA at 240 V AC, 100 kA at 400 V AC
• Insulation voltage: 1000 V AC with pollution degree 3
• Screw-type terminals for main circuit; three-pole main current circuit (3 poles)
• Compact footprint: approx. 70 mm width, 170 mm height, 176 mm depth (per datasheet)

Technical Specifications

• Article Number: 3RV2742-5QD10
• Series: SIRIUS 3RV2
• Operational Current (Iu): 70 A
• Maximum Breaking Capacity (Icu): 100 kA at 240 V AC; 100 kA at 400 V AC; 65 kA at 480 V Y/277 V (UL)
• Insulation Voltage (Ui): 1000 V AC (pollution degree 3)
• Width × Height × Depth: 70 mm × 170 mm × 176 mm
• Rated Operating Voltage: 20…600 V AC; 50/60 Hz
• Power Loss (at rated current): ~23.5 W
• Ambient Operating Temperature: –20 °C to +60 °C
• Protection Rating (Front): IP20

Compliance & Certifications

• UL 489 and CSA C22.2 No. 5 approved for system protection applications
• Designed for industrial control and power-distribution environments—mechanical service life ~25 000 switching operations

Applications

This circuit breaker is suitable for usage in industrial switchgear, power distribution boards, main feeders, motor control centres and emergency-off circuits. It is particularly well suited where high fault current capability and UL/CSA system protection compliance are required.