Product Description

Siemens 5SL7440-8RC MCB 40A 4-Pole D Characteristic 10kA

The Siemens 5SL7440-8RC is a SENTRON 5SL7 miniature circuit breaker (MCB) designed to provide reliable protection against overload and short-circuit conditions in electrical installations. This Siemens MCB is rated at 40 A, features a 4-pole configuration, D tripping characteristic, 415 V rated voltage, and 10 kA short-circuit breaking capacity.

The Siemens 5SL7440-8RC 40A 4-pole MCB is suitable for electrical circuits where higher starting or inrush currents may occur. Its D characteristic allows greater tolerance for short-duration starting currents compared with lower magnetic trip curves, making it suitable for selected applications involving motors, transformers, inductive loads and other equipment with higher inrush currents.

The 4-pole design allows the MCB to provide coordinated switching and protection across four poles in compatible electrical systems. It can be used in suitable distribution boards, industrial control panels, machinery panels and electrical switchboards where a 4-pole protective device is required.

With a 10 kA short-circuit breaking capacity, the 5SL7440-8RC is designed to interrupt specified short-circuit fault currents within its applicable ratings. This helps protect electrical circuits, cables and connected equipment from potentially damaging overload and short-circuit conditions.

As part of the Siemens SENTRON 5SL7 series, the 5SL7440-8RC is suitable for professional electrical protection applications. It can be considered by panel builders, OEMs, electrical contractors, system integrators and industrial maintenance teams requiring Siemens MCB solutions.

The 40 A D-curve MCB is particularly useful where the load profile includes higher starting currents. However, the final MCB selection should always be based on the connected load, conductor capacity, prospective short-circuit current, system voltage and coordination with other protective devices.

Key Features

• Siemens 5SL7440-8RC
• SENTRON 5SL7 series miniature circuit breaker
• Rated current: 40 A
• Rated voltage: 415 V
• 4-pole (4P) configuration
• D tripping characteristic
• 10 kA short-circuit breaking capacity
• Designed for overload protection
• Designed for short-circuit protection
• Suitable for higher starting or inrush-current applications
• Suitable for selected motor applications
• Suitable for transformer-related circuits
• Suitable for inductive electrical loads
• Suitable for industrial control panels
• Suitable for commercial distribution boards
• Suitable for OEM and machinery applications

Applications

The Siemens 5SL7440-8RC 40A 4-pole D curve MCB can be considered for:

• Industrial electrical distribution panels
• Three-phase and multi-phase electrical systems
• Motor-related electrical circuits
• Transformer circuits
• Industrial control panels
• Machine control panels
• Manufacturing facilities
• Commercial distribution boards
• Electrical switchboards
• OEM electrical panels
• Industrial automation systems
• Machinery installations
• Infrastructure projects
• Power distribution applications
• Electrical equipment protection

Benefits

The Siemens 5SL7440-8RC provides dependable protection for electrical systems requiring a 40 A, 4-pole MCB with D tripping characteristic. The D characteristic is suitable for selected circuits where equipment produces relatively high starting or inrush currents during normal operation.

This makes the device useful for appropriately designed applications involving motors, transformers, inductive loads and equipment with higher startup currents. Selecting the correct curve can help avoid unwanted tripping during normal equipment startup while still providing protection against applicable overcurrent conditions.

The 10 kA breaking capacity provides protection against specified short-circuit fault conditions. When correctly selected and coordinated with the electrical installation, the MCB can help protect cables and connected equipment from overload and short-circuit events.

Its 4-pole construction provides a compact solution for electrical systems requiring four-pole protection and switching. This can help maintain an organized arrangement within industrial panels, distribution boards and electrical switchboards.

The 415 V rating makes the 5SL7440-8RC suitable for compatible electrical distribution systems within its specified voltage rating. Its 40 A rated current makes it appropriate for suitably designed medium-current circuits where the load and conductor characteristics are correctly matched.

The Siemens 5SL7 series can also be combined with compatible accessories in suitable configurations, providing options for additional electrical protection, signalling or monitoring functions.

The Siemens 40 A 4P D curve MCB can be sourced for suitable projects across Faridabad, Delhi NCR, Noida, Gurgaon/Gurugram, Ghaziabad, Punjab, Mumbai, Pune, Ahmedabad, Hyderabad, Bengaluru/Bangalore, Chennai, Kolkata, Jaipur, Chandigarh, Ludhiana and other major industrial locations across India.

Always verify the load characteristics, cable rating, prospective fault current, system voltage and protection coordination before installation.

Why Buy Siemens 5SL7440-8RC from SB Smart?

SB Smart supplies Siemens industrial electrical, automation and circuit protection products for OEMs, panel builders, electrical contractors, system integrators and industrial maintenance teams across India.

The Siemens 5SL7440-8RC 40A 4P D characteristic MCB is suitable for customers looking for Siemens circuit protection products for industrial, commercial, machinery and infrastructure applications.

SB Smart supports sourcing requirements across Faridabad, Delhi NCR, Noida, Gurgaon/Gurugram, Mumbai, Pune, Ahmedabad, Hyderabad, Bengaluru/Bangalore, Chennai, Kolkata, Chandigarh, Ludhiana and other major Indian industrial markets.

FAQs

1. What is Siemens 5SL7440-8RC?
It is a Siemens SENTRON 5SL7 miniature circuit breaker rated 40 A, 4-pole, D characteristic, 415 V and 10 kA breaking capacity.

2. What is the rated current of this MCB?
The rated current is 40 A.

3. How many poles does the 5SL7440-8RC have?
It is a 4-pole (4P) miniature circuit breaker.

4. What is the tripping characteristic?
It has a D tripping characteristic, suitable for selected circuits with higher starting or inrush currents.

5. What is the breaking capacity?
The specified short-circuit breaking capacity is 10 kA.

6. What is the rated voltage?
The specified rated voltage is 415 V.

7. Where can the 5SL7440-8RC be used?
It can be used in suitable industrial distribution systems, control panels, machinery, motor-related circuits, transformer applications, commercial installations and OEM equipment.

8. Can a D-curve MCB be used for motor applications?
A D-curve MCB can be suitable for selected motor circuits because it accommodates higher starting current, but final selection should be based on the motor's starting characteristics, cable rating, fault level and overall protection coordination.