Siemens Miniature circuit breaker, C, 1-pole, 230/400V, 10kA, 40A Part number 5SY4140-7

Product Overview

The Siemens 5SY4140-7 is a 1-pole miniature circuit breaker from the SENTRON 5SY4 series, rated for 40 A, with a C-curve tripping characteristic, and designed for 230/400 V AC applications. It features a compact 18 mm width, a breaking capacity of up to 10 kA (according to EN 60898) and is suited for both industrial and infrastructure installations where reliable overload and short-circuit protection are required.

Key Features

• 1-pole miniature circuit breaker, SENTRON 5SY4 series
• Rated current: 40 A
• Tripping characteristic: C-curve (suitable for general branch-circuit protection)
• Rated supply voltage: 230/400 V AC, 50/60 Hz
• Breaking capacity: 10 kA at AC (EN 60898); up to 15 kA under IEC 60947-2 conditions
• Narrow width: 18 mm (1 module width) — saves panel space
• Halogen-free, silicon-free, sealable design for industrial reliability

Technical Specifications

• Article Number: 5SY4140-7
• Number of Poles: 1 (single-phase or phase conductor)
• Rated Current (AC): 40 A at 40 °C ambient
• Insulation Voltage (Ui): 440 V AC
• Rated Breaking Capacity (Icn): – 10 kA according to EN 60898 – up to 15 kA according to IEC 60947-2
• Mechanical Service Life: Typically 10,000 switching cycles
• Width (Module Units): 18 mm (1 module)
• Depth: 76 mm; installation depth: 70 mm
• Ambient Operating Temperature Range: –40 °C to +70 °C
• Tightening Torque (Screw Terminals): 2.5 – 3.5 N·m

Compliance & Certifications

• Designed and certified in accordance with IEC / EN 60898-1 and IEC / EN 60947-2 standards for miniature circuit breakers
• Suitable for use in infrastructure and industrial installations with degree of pollution 3 and over-voltage category III
• Halogen-free and sealable design meets industrial requirements

Applications

Ideal for branch-circuit protection in control panels, machine installations and distribution boards in industrial, infrastructure or commercial environments. The 5SY4140-7 provides reliable overload and short-circuit protection in space-constrained installations, especially where a compact 18 mm width is beneficial.