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Siemens 5SY4240-7 Miniature Circuit Breaker — 2-Pole, Type C, 40A

Siemens 5SY4240-7 2-pole miniature circuit breaker.

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ManufacturerSiemens

Part number5SY4240-7

Rated Voltage 400V AC

Breaking Capacity 10kA

Poles 2

Tripping Characteristic Type C

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2-pole circuit protection Type C tripping curve for inductive loads 10kA breaking capacity 400V AC rated 70mm standard installation depth Siemens engineered

Product description

The Siemens 5SY4240-7 is a 2-pole miniature circuit breaker featuring a Type C tripping characteristic, suitable for loads with moderate inrush currents. It is rated for 400V AC with a 10kA breaking capacity. This model has a rated current of 40A and a standard 70mm depth.

This circuit breaker is commonly employed in industrial and commercial settings to protect electrical circuits and equipment from overloads and short circuits. Its Type C curve makes it an excellent choice for circuits powering motors, transformers, and lighting systems where temporary current surges are expected.

Stanlo Automation, your veteran-owned specialist in surplus industrial automation parts, offers the Siemens 5SY4240-7. We provide reliable access to quality components to support your maintenance and operational needs.

Technical specifications

Rated Voltage	400V AC
Breaking Capacity	10kA
Poles	2
Tripping Characteristic	Type C
Rated Current	40A
Depth	70mm
Series	5SY4

Common applications

Motor control

Industrial power distribution

Commercial buildings

Lighting circuits

Automation systems

Machinery protection

Compatible systems

Standard DIN rail mounting Siemens electrical distribution equipment

Also known as

Siemens 5SY4240-7 MCB Siemens 40A Type C breaker 5SY4 Type C 40A

Replaces / compatible with

The Siemens 5SY4240-7 can be used as a direct replacement for other Siemens 5SY4 series miniature circuit breakers with identical specifications. It is designed for mounting on standard 35mm DIN rails.

Technical note

Expert tip

For circuits with significant inductive loads, verify that the 40A rating and Type C characteristic are appropriate to prevent nuisance tripping during normal operation.

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Frequently asked questions

What are the typical applications for a Siemens 5SY4240-7 Type C circuit breaker?

The Siemens 5SY4240-7 with a Type C tripping curve is suitable for circuits containing loads with moderate inrush currents, such as small to medium-sized motors, transformers, fluorescent lighting ballasts, and vending machines. It offers protection against overloads and short circuits while accommodating these temporary current surges.