Electrical Apparatus

STELLAR Electrical Apparatus and Low Voltage Components

Electrical apparatus is the family of devices that protect, control, switch, and meter power on the low voltage side of a distribution system, the circuit breakers, contactors, relays, transfer switches, and instruments that fill a distribution board or a control panel. STELLAR supplies the full low voltage apparatus range, from the main air circuit breaker down to the final miniature breaker, so a project can source its protection, control, and metering devices from one place.

These devices are also the building blocks of an assembled panel: the same breakers, contactors, and meters are fitted into our low voltage switchgear and distribution boards. You can take the loose components for your own boards, or have STELLAR assemble them into a complete, type-tested panel, all built to IEC standards. This page is a catalogue of the apparatus we can supply across five groups.

Full Low Voltage Apparatus Range

From main air circuit breakers to final miniature breakers, contactors, relays, and meters in one catalogue.

Protection, Control, and Metering

Devices for every job on the low voltage side, circuit protection, motor control, and energy metering.

Approved Component Brands

Components from approved brands such as ABB, Schneider, and proven domestic equivalents, to your project's list.

Apparatus and Panel in One Source

Buy the loose apparatus, or have it assembled into our distribution boards and panels as one package.

Electrical Apparatus Range

Category	Typical Devices	Example Models
Distribution apparatus	Air circuit breaker (ACB), moulded-case breaker (MCCB), isolator and fuse combination, instrument transformers	GTW1 ACB
Terminal apparatus	Miniature breaker (MCB), residual-current device (RCD / RCBO), surge protector (SPD), terminal distribution board	GTB6-63 MCB, GTZL / GTM2L RCD
Control apparatus	Contactor, thermal overload relay, motor starter (CPS), soft starter, variable-frequency drive (VFD)	CPS motor starter
Power apparatus	Automatic transfer switch (ATS), voltage stabiliser, reactor and capacitor bank	Dual-power ATS
Electronic apparatus	Smart circuit breaker, power meter, intelligent distribution system	Smart power meter

The range also includes over- and under-voltage protectors (GTB1) and protection components for the distribution board. Loose apparatus can be supplied on its own, or fitted and tested inside a low voltage switchgear assembly built to your single-line diagram.

Circuit Protection and Distribution

Protection and distribution apparatus guards the circuits and splits the supply. Air circuit breakers (ACB) sit on the main incomer, moulded-case breakers (MCCB) protect the feeders, and miniature breakers (MCB) with residual-current devices (RCD and RCBO) cover the final circuits, backed by surge protectors and instrument transformers.

· Air and moulded-case breakers for main and feeder protection
· Miniature breakers and RCD or RCBO for final circuits
· Surge protection and instrument transformers

Motor Control and Drives

Control apparatus starts, stops, and protects motors and other loads. It covers contactors, thermal overload relays, integrated motor starters (CPS), soft starters, and variable-frequency drives for speed control.

· Contactors and thermal overload relays
· Integrated motor starters and soft starters
· Variable-frequency drives for motor speed control

Power Transfer and Smart Metering

Power and electronic apparatus manages the supply and its monitoring. Automatic transfer switches (ATS) change over to backup power, voltage stabilisers and capacitor banks steady the supply and correct power factor, and smart breakers, power meters, and distribution systems add digital monitoring.

· Automatic transfer switches and voltage stabilisers
· Reactors and capacitor banks for power-factor correction
· Smart breakers, power meters, and monitoring systems

About STELLAR

STELLAR is a Singapore-headquartered manufacturer of switchgear, transformers, and complete power distribution equipment, serving utilities, contractors, and distributors in 50+ countries. From single-line diagram to commissioning support, we deliver project-configured electrical systems built to IEC and GB standards.

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FAQs

What is electrical apparatus?

Electrical apparatus is the set of low voltage devices that protect, control, switch, and meter electricity below 1000 V, the circuit breakers, contactors, relays, transfer switches, and instruments that fill a distribution board or control panel. They take the low voltage output of a distribution transformer and deliver it safely to the final loads.

What types of low voltage apparatus do you supply?

The full low voltage range across five groups: distribution apparatus such as ACB and MCCB; terminal apparatus such as MCB, RCD or RCBO, and surge protectors; control apparatus such as contactors, relays, motor starters, soft starters, and drives; power apparatus such as transfer switches, stabilisers, and capacitors; and electronic apparatus such as smart breakers and meters.

What is the difference between distribution and control apparatus?

Distribution apparatus protects and divides the main supply, using larger breakers like the air circuit breaker and the moulded-case breaker. Control apparatus operates the loads, mainly motors, using contactors, overload relays, and starters. One guards the circuit; the other switches the load.

Can these devices be supplied inside a panel or switchgear?

Yes. The same breakers, contactors, and meters are assembled into our low voltage switchgear and distribution boards, so you can buy the loose apparatus for your own panels or take a complete, factory-tested assembly.

What standards and component brands do you offer?

The switching devices are built to IEC 60947 and the miniature breakers to IEC 60898, with components from approved brands such as ABB, Schneider, and proven domestic equivalents chosen to your project's approved list.

Low Voltage Electrical Apparatus Explained

On the low voltage side, electrical apparatus is the collective name for the devices that protect, control, switch, and measure electricity below 1000 V. They fill the distribution boards, control panels, and consumer units that take the output of a distribution transformer and deliver it safely to lighting, sockets, motors, and machines. A single low voltage installation may hold dozens of these devices, from one large incoming breaker to many small final-circuit breakers.

The Five Groups of Low Voltage Apparatus

The range divides into five groups by what each device does. Distribution apparatus, the air circuit breaker (ACB), moulded-case breaker (MCCB), isolators, and instrument transformers, handles the main protection and measurement. Terminal apparatus, the miniature breaker (MCB), residual-current device (RCD and RCBO), and surge protector (SPD), guards the final circuits. Control apparatus, contactors, overload relays, motor starters, soft starters, and variable-frequency drives, runs the motors and loads. Power apparatus, automatic transfer switches (ATS), voltage stabilisers, and capacitors, manages and steadies the supply. Electronic apparatus, smart breakers, power meters, and distribution systems, adds digital monitoring and control.

Standards for Electrical Apparatus

Low voltage switching and control devices are governed by IEC 60947, the standard for low voltage switchgear and controlgear that covers circuit breakers, contactors, and starters. Miniature circuit breakers for household and similar circuits follow IEC 60898. When the devices are assembled into a board or panel, that assembly is built and tested to IEC 61439. STELLAR supplies apparatus and assemblies to these standards, with the equivalent GB standards where a project calls for them.

From Loose Components to a Tested Panel

These devices are the building blocks of an assembled panel, so STELLAR can supply them either way. Take the loose apparatus for your own boards, or have the same breakers, contactors, and meters fitted and tested inside a low voltage switchgear assembly, a distribution board, or a feeder pillar, configured from your single-line diagram. Sourcing the devices and the enclosure from one base keeps the selection coordinated and the responsibility in one place.