Why must control transformers in UAE MCC panels use 110V secondary, not 240V?

DEWA Distribution Standards and IEC 60204-1 (electrical equipment of machines) both recommend or mandate 110V centre-tapped control circuits in industrial panels for personnel safety. A 110V centre-tapped transformer produces 55V to earth on each leg — if a maintenance technician accidentally touches one conductor while earthed, the shock voltage is only 55V rather than 240V. This significantly reduces electrocution risk in live-work situations.

How do I size the control transformer for my MCC panel?

Add up the VA burden of all loads on the control circuit: each contactor coil (typically 5–15VA), each relay coil (3–8VA), each pilot lamp (1–5VA), and any other control devices. Multiply the total by 1.25 (25% safety margin) to get the minimum transformer VA rating. For inrush-heavy loads (many contactors closing simultaneously), apply an additional 1.5× inrush factor. Noor Al Bawadi can assist with burden calculations for your panel design.

What is the difference between cable-type and terminal-type control transformers?

Cable-type transformers have pre-wired cable tails on the primary and secondary windings, terminated in ferrules. These connect directly to terminal blocks in the panel, making installation neat and straightforward for UK-standard panel wiring. Terminal-type transformers have screw terminal blocks built into the transformer body, which can simplify wiring in some panel layouts but require more clearance around the transformer.

Can I use two control transformers in parallel to increase capacity?

No — control transformers should not be paralleled unless they are specifically designed and matched for parallel operation (same VA rating, same impedance, phase matched). Paralleling mismatched transformers causes circulating currents, overheating and potential failure. If your load exceeds the capacity of the largest available single unit, contact Noor Al Bawadi to discuss a custom solution.

Do Micron Electric UK control transformers have built-in primary or secondary fusing?

The transformers themselves do not include built-in fuses. Industry standard practice (and DEWA requirement) is to protect the primary winding with an MCB or fuse at 125–150% of the rated primary current, and to fuse the secondary at the transformer output before the control bus. Noor Al Bawadi stocks matching MCBs and fuse holders to complete the installation.

Control Transformer (Cable Type)

Micron Electric UK cable-type control transformers, 25VA to 2000VA. 240V primary, 110V or 24V secondary with cable leads. DEWA-compliant. In stock Sharjah. Delivery across UAE.

4 Products

100VA CONTROL TRANSFORMER 230/24V - CABLE TYPE

The 100VA Control Transformer 230/24V (Cable Type) meets IEC standards for UAE industrial use. Compact and compatible with major panel brands. In stock in Sharjah — Call us for same-day delivery to Dubai, Abu Dhabi.

SKU: 100V240

50VA CONTROL TRANSFORMER 230/24V - CABLE TYPE

The 50VA Control Transformer 230/24V - Cable Type meets IEC standards for UAE industrial applications. Compatible with control panels and machinery in Dubai, Sharjah, and Abu Dhabi. In stock in Sharjah – Call us for same-day delivery.

SKU: 50V240

40VA CONTROL TRANSFORMER 230/24V - CABLE TYPE

The 40VA Control Transformer 230/24V UAE is an IEC-compliant compact transformer ideal for electrical panels and automation systems. Compatible with Siemens, ABB, and Schneider equipment. In stock in Sharjah – Call us for same-day delivery across UAE.

SKU: 40V240

25VA CONTROL TRANSFORMER 230/24V - CABLE TYPE

The 25VA Control Transformer 230/24V meets IEC standards for UAE industrial applications. Compact design for Dubai, Sharjah, and Abu Dhabi electrical panels. In stock in Sharjah. Call us for urgent orders.

SKU: 25V240

About Control Transformer (Cable Type)

Control transformers step down the panel supply voltage to a safer control circuit voltage — typically from 240V AC mains to 110V AC or 24V AC for operating control relays, contactor coils, pilot lamps and timers. Micron Electric UK cable-type control transformers have flying lead connections (pre-wired cable tails) on both primary and secondary windings, simplifying installation in UK-standard LV panels where connection to terminal blocks is preferred over direct busbar connection.

Product Range & Specifications

Rating (VA)	Primary	Secondary Options	Type	Typical Load
25VA	240V AC	110V AC / 24V AC	Cable type	2–3 relay coils, 2–3 pilot lamps
40VA	240V AC	110V AC / 24V AC	Cable type	4–5 relay coils
63VA	240V AC	110V AC / 24V AC	Cable type	Small motor starter circuits
100VA	240V AC	110V AC / 24V AC	Cable type	Medium control circuits, 6–8 contactors
160VA – 250VA	240V AC	110V AC / 24V AC	Cable type	MCC control bus, multiple starter circuits
400VA – 2000VA	240V AC	110V AC / 24V AC	Cable type	Large MCC sections, crane panels

Why 110V Control Circuits Are Required in UAE

DEWA (Dubai Electricity and Water Authority) and ADDC (Abu Dhabi Distribution Company) require 110V AC control circuits in Motor Control Centres (MCC) and industrial switchboards. This is because 110V (centre-tapped to 55V earth) is significantly safer than 240V for maintenance personnel working on live control circuits. Using 110V control transformers is mandatory in DEWA-compliant MCC builds and is best practice across UAE industrial electrical installations.

Common Applications in UAE

Motor Control Centres (MCC) — mandatory 110V control bus for DEWA-compliant MCC panels in Dubai
Pump and compressor starter panels — 110V control circuit for start/stop, overload and auxiliary relays
Crane and hoist control panels — 110V for safety and travel limit circuits in UAE port and logistics facilities
Industrial process control — 24V AC secondary for interfacing with electronic controllers in factory automation
HVAC plant panels — control transformer supplying the 110V rail for AHU and chiller starter control circuits

Authorized UAE Distributor

Noor Al Bawadi is the authorized UAE distributor for Micron Electric UK control transformers. We stock the full cable-type range in Sharjah from 25VA to 2000VA. All transformers are manufactured to BS EN 61558 and are accepted in DEWA-compliant panel builds across Dubai and the UAE. Fast delivery available — contact us for project pricing on bulk quantities.

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