Switching & Control Devices
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Switching & Control Devices

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8 products

Product list

Switching & Control Devices

Changeover Switches

Manual and motorised changeover switches for transfer between two supplies, such as mains and generator.

  • StandardIEC 60947-3, IEC 60947-6-1
Control Relays & Timers

Control Relays & Timers

Interface relays, timers and monitoring relays for control and automation circuits.

  • StandardIEC 61810-1, IEC 60947-5-1
HRC Fuses & Fuse Switch Units

HRC Fuses & Fuse Switch Units

High-rupturing-capacity fuse links, fuse bases and fuse switch units for short-circuit protection.

  • StandardIEC 60269
Circuit Protection
Isolators & Switch Disconnectors

Isolators & Switch Disconnectors

Load-break switches and isolators for safe isolation of circuits and equipment.

  • StandardIEC 60947-3
Switching & Control Devices

Power Contactors

AC and DC contactors for switching motors and other loads, with auxiliary contacts and coil options.

  • StandardIEC 60947-4-1
Push Buttons, Indicators & Selector Switches

Push Buttons, Indicators & Selector Switches

Pilot devices for panel doors and control stations: push buttons, indicator lamps, selector switches and emergency stops.

  • StandardIEC 60947-5-1
Switching & Control Devices

Surge Protection Devices (SPD)

Surge protective devices that divert lightning and switching surges away from equipment.

  • StandardIEC 61643-11 (AC), IEC 61643-31 (DC)
Circuit Protection
Thermal Overload Relays & MPCBs

Thermal Overload Relays & MPCBs

Overload relays and motor protection circuit breakers that protect motors against overload and phase loss.

  • StandardIEC 60947-4-1, IEC 60947-2
Circuit Protection
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Switching & Control Devices from SKE Bharat

These are the devices that sit between the breaker and the load: power contactors, thermal overload relays and MPCBs, isolators and switch disconnectors, HRC fuses and fuse switch units, changeover switches, control relays and timers, push buttons, indicators and surge protection devices. Together they make up a motor starter or a controlled feeder.

A common starter is a breaker or fuse for short-circuit protection, a contactor to switch the motor, and an overload relay for running protection. The contactor is chosen by its utilisation category, and for a cage motor that is usually AC-3. For crane or plugging duty, which means frequent starts, reversals and inching, the category is AC-4, and the contactor must be derated or selected up. An MPCB combines short-circuit and overload protection with manual on/off in one device, saving space on small motor feeders. HRC fuses offer high breaking capacity at low cost where fault levels are high.

When you choose, look at:

  • Motor full-load current and the overload relay setting range.
  • Contactor coil voltage (24 V DC, 110 V AC or 230 V AC), and auxiliary contact count.
  • Coordination type 1 or type 2 between the short-circuit device and the contactor.
  • Isolator rating and whether the load break duty is AC-23.
  • SPD type and the installation point, such as Type 1 at the incomer, Type 2 at distribution boards.

Use the motor current and cable calculator for the starting current, and see the upstream circuit breakers for the protective device.

Frequently asked questions

What is the difference between a contactor and a relay?

A contactor is built to switch power circuits such as motors and heaters, with heavy main contacts, arc chutes and a coil for repeated operation. A relay is a lighter switching device used for control signals, interlocks and auxiliary functions. Never use a control relay to switch a motor directly unless its contact rating allows it.

What is an MPCB and how is it different from an MCCB?

A motor protection circuit breaker is a compact device with adjustable thermal overload and a fixed magnetic trip, designed for motor feeders and often with phase-failure sensing. An MCCB is a general feeder breaker with adjustable settings and larger ratings. For a small motor, an MPCB plus a contactor gives a complete starter.

What does coordination type 1 and type 2 mean?

These describe what is permitted to be damaged after a short circuit in a starter. With type 1, the contactor or relay may be damaged but there is no hazard to people. With type 2, only light welding of contacts that can be easily separated is allowed. Type 2 gives faster recovery after a fault.

When do I need a surge protection device?

An SPD limits transient overvoltage from lightning or switching, and is advised where a lightning strike risk exists, or where electronics, drives and PLCs are installed. Type 1 devices go at the service entrance, Type 2 at distribution boards, and Type 3 close to sensitive loads. Good earthing is essential for them to work.

What is the difference between an isolator and a switch disconnector?

An isolator opens a circuit without load to give a visible, safe gap for maintenance and is not made to break load current. A switch disconnector can make and break load current as well as isolate. Which one is required depends on the circuit, and a qualified engineer should confirm.