The UTMCU18 is an 18-way metal consumer unit tailored for commercial tenants and large properties. Its 394 mm wide chassis accommodates extensive MCB/RCBO arrays, while cold-rolled steel, IP20/IK05 ratings, and all-round knockouts handle demanding installations.

Specifications

Feature	Detail
Standard Compliance	BS EN 61439-3 (Consumer Unit), BS EN 60947-3 (Main Switch), BS EN 60898-1 (MCB)
Operating Voltage	230V AC, 50/60Hz
Rated Current	40A, 63A, 100A (depends on incoming device)
Protection Rating	IP20 (Indoor Use Only)
Impact Protection	IK05
Material	Cold-rolled steel sheet with white RAL9003 powder coat
Mounting	Wall-mounted (Flush or Surface compatible with optional kits)
Cable Entry	Top, Bottom, Sides, Rear – Multiple knockouts (20mm, 25mm, 32mm, 40mm)
Internal Layout	Raised DIN rail, extra space for RCBOs, flexible circuit configuration

Full Model Range – Choose Your Circuit Count

Model No.	Usable Ways	Width (mm)	Height (mm)	Depth (mm)	Best For
UTMCU4	4 ways	123	243	108	Small flats, sheds, garages
UTMCU5	5 ways	141	243	108	Studio apartments, small offices
UTMCU6	6 ways	158	243	108	1–2 bedroom homes
UTMCU8	8 ways	208	243	108	Standard 3-bedroom house
UTMCU10	10 ways	243	243	108	Larger homes, light commercial
UTMCU14	14 ways	315	243	108	Multi-unit dwellings, workshops
UTMCU18	18 ways	394	243	108	Commercial tenants, large properties
UTMCU22	22 ways	467	243	108	Industrial sub-panels, complex setups

Key Features – Built for Electricians, Trusted by Installers

CE Certified to EU/UK Standards

Third-party laboratories have type-tested this chassis to BS EN 61439-3, BS EN 60947-3, and BS EN 60898-1. Installers can proceed with confidence that the unit meets BS 7671 expectations.

Heavy-Duty Steel Enclosure

Cold-rolled carbon steel is pressed into shape, then armoured with a consistent RAL9003 polyester skin. IK05-rated, it shrugs off the dents and scrapes that come with daily trade use.

Flexible Cable Entry

Factory-punched apertures ring the roof, floor, left wall, right wall, and back panel:

• Roof & Floor: 20 mm, 25 mm, 32 mm

• Sidewalls: 32 mm plus 40 mm elongated slots

• Back panel: Wide trunking and conduit channels

Cables can be drawn from any bearing, removing the need for site drilling.

Spacious Interior Design

A stand-off mounted 35 mm DIN rail lifts devices well clear of the base. The void beneath gives conductors the radius they need and stops RCBOs from fighting for space.

Secure Magnetic Lid Closure

A potent magnet secures the hinged steel lid. It stays put against vibration and knocks, yet opens with a light tug when the breaker needs resetting.

Modular Wiring Configurations

The 18-way chassis supports four distinct approaches:

• a Main Switch layout for simple isolation

• a Dual RCD layout for budget-conscious zone splitting

• a High Integrity layout blending RCDs with selective RCBOs

• an RCD-only layout for dedicated sub-panel duty.

Pre-Installed Ground & Neutral Bars

Solid copper busbars are already in place, fitted with ample terminals. Connect the main earth and neutral feeds straight in-no extra hardware needed.

Clear Circuit Labeling Area

A peel-off label behind the lid lets you chart every way. When a fault crops up months later, tracing the right breaker takes seconds.

Key Applications

Commercial leaseholds in retail parks and business centres needing segregated tenant circuits

Suburban estates with outbuildings, pool houses, and garden offices all fed from one main board

Data centres and server rooms requiring segregated UPS, cooling, and rack power circuits

Schools and clinics separating general power from critical supply lines

Factory floor sub-panels branching heavy machinery off the primary incoming feed

Our Factory

We are equipped with complete distribution box production equipment and a strong technical and production team. Meanwhile, we have been continuously updating and upgrading our equipment to meet the diverse needs of customers.

Fast FAQ – Answers for Pros & DIYers

Q1: Can the 18-way board be divided into three or more RCD zones?

A: The standard Dual RCD layout provides two zones. For three or more zones, adopt a High Integrity configuration and fit selective RCBOs on the circuits that need separate protection.

Q2: How do I keep track of 18 separate circuits without confusion?

A: Use the integrated directory card behind the door and group circuits by floor or function-e.g., ground-floor lighting, first-floor sockets, cooker, shower. Colour-coded cable markers at the termination points also speed up future fault-finding.

Q3: Can I split the 18 ways across two separate buildings fed from one incoming supply?

A: No. The UTMCU18 is a single distribution point. For multiple buildings, install separate sub-panels with their own protection, fed via appropriate isolators from the main board.

Q4: Will an 18-way board become too hot when fully populated?

A: The steel enclosure acts as a heat sink, and the raised DIN rail promotes natural airflow between devices. Ensure the ambient temperature stays within -5°C to +40°C and leave at least 50 mm clearance on all sides for ventilation.

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