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August 31, 2015
Basics of Molded Case Circuit Breaker

Molded Case Circuit Breakers (MCCBs) refer to breakers where in the tripping mechanism is fitted in a molded frame and the breaker is used for rugged industrial use. These circuit breakers generally have higher breaking capacities as compared to MCBs and can handle larger amperes. Also, these breakers have features to provide extra protection from Short Circuits, Ground Faults and Overload protection.

The other low voltage circuit breaker types are : Miniature Circuit Breakers, Motor Protection Circuit Breakers, Earth Leakage Circuit Breaker, and Air Circuit Breaker. (more…)

August 28, 2015
Basics of Miniature Circuit Breaker

Miniature Circuit Breakers (MCBs) are designed to protect the cable downstream of the device against overloads and short circuits, preventing damage to cables and equipments.

The other low voltage circuit breaker types are : Molded Case Circuit Breakers, Motor Protection Circuit Breakers, Earth Leakage Circuit Breaker, and Air Circuit Breaker.

MCB Operation and characteristics

An MCB is a thermo-magnetic device, having two methods of circuit interruption. A thermal mechanism, usually a bi-metallic strip, provides protection against moderate overcurrent. The heating action of the current causes the bi-metallic strip to curve and break circuit contact. This method is complemented by a solenoid designed to respond to larger currents.

There are 3 MCB types, Type B, Type C and Type D, and the speed at which they trip depends upon the level of overload, and is usually determined by a thermal device within the MCB.

Selecting the right one should be done in accordance with BS 7671:Requirements for Electrical Installations (The IEE Regulations, Sixteenth Edition) and will ensure that the device will not give unwanted tripping.

All 3 miniature circuit breaker types use a magnetic fault protection, which trips the MCB within one tenth of a second when the overload reaches a set level.

  • Type B trips between 3 and 5 time full load current and is generally used for lighting and domestic applications.
  • Type C trips between 5 and 10 times full load current and is generally used for industrial and commercial applications.
  • Type D trips between 10 and 20 times full load current and is generally used for specialist industrial use with high inrush currents.

(Inrush current is the current that a load draws when the supply is switched on.Values can range from being insignificant (a few times the normal current), 5 to 10 times normal current for iron core transformers (e.g. conventional ballast fluorescent luminaires) and up to 20 times normal current for much modern electronic equipment, including the power supplies found in user equipment.)

Breaking Capacity

The breaking capacity of an miniature circuit breaker is referred to as the current which it is able to interrupt which getting damaged or causing electric arc with unacceptable duration. It is measured in kA. The generally used breaking capacities are 6kA and 10kA.

The basic principle of working of a circuit breaker remains the same irrespective of the type of circuit breaker and can be understood here.

The user can choose good quality electrical breaker components from L&T, Siemens, Schneider, Hager, Legrand or other reputed brands.

June 23, 2015
The reliable way to detect dust concentrations – FWE200DH: Extractive dust measuring system for wet gases

The FWE200DH represents SICK‘s next stage in the development of a dust measuring device for measuring dust concentration in wet gases. The gas is extracted via a sampling probe and heated above dew point. Any droplets in the gas vaporize, making it impossible for them to falsify the measurement results. Using the scattered light principle afterward enables even minimal dust concentrations to be measured. (more…)

June 23, 2015
Polycab targets export-focused expansion

“The key focus area for us is the oil and gas sector, specifically in the MENA region, which has tremendous growth potential,” says Inder Jaisinghani, Chairman and MD, Polycab Group

With a turnover of ` 4,500 crores during last fiscal, Polycab is one of the leading cables and wires players in India. In an exclusive interview with EPR, Inder Jaisinghani discusses a broad range of topics that includes current market scenario and Polycab’s growth strategies. (more…)

June 21, 2015
TeSys is tested and proven for IE3 motors

Motor efficiency regulations are getting stricter around the world. It’s time to prepare your business for a more energy-efficient future!

With TeSysTM motor starter range you can switch to premium-efficiency motors with peace of mind, as all products have proven fully compliant with IE3 regulations.

TeSys provides best-in-class features for protection, monitoring, and control in motor applications enabling you to:

Cut contactor power consumption in half thanks to low consumption coil
Increase the safety and reliability of your infrastructure
Simplify installation and maintenance with worldwide availability and support
Reduce your carbon footprint and ensure compliance with environmental regulations
All TeSys devices are certified with the Green Premium eco-mark, providing comprehensive information on the environmental impact of a product including RoHS and REACh compliance, PEP documentation, and End of Life Instruction (EoLI).

Source : Schneider

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