Control & Industrial Transformers, Single Phase 3kVA – 40kVA | CL Range

The CL Range 3kVA–40kVA covers larger single-phase control and industrial transformers for machinery, panels, production equipment and specialist electrical applications.

Manufactured in the UK by Boardman Transformers, this larger CL range is suitable for applications requiring higher-rated single-phase voltage transformation. Primary and secondary voltages can be specified to suit the application, with a range of voltage and connection options available.

These transformers conform to IEC61558 and IEC60076 and are built as Class 1 isolation transformers with an earth screen between primary and secondary windings.

Key Features

• – Larger single-phase CL control and industrial transformer range
• – Ratings from 3kVA to 40kVA
• – UI two-limb construction
• – Designed for machinery, panels and industrial applications
• – Primary and secondary voltages specified to suit the application
• – Class 1 isolation transformer with earth screen between primary and secondary
• – Suitable for 50/60Hz applications
• – Insulation Class B, F or H options
• – Designed to conform to IEC61558 and IEC60076
• – UK manufactured by Boardman Transformers

Suitable Applications

The CL 3kVA–40kVA range is suitable for higher-rated single-phase control and industrial applications where a standard lower-rated control transformer is not sufficient.

• – Larger industrial machinery
• – Production equipment
• – Control panels and electrical assemblies
• – Manufacturing equipment
• – OEM machinery
• – Specialist single-phase transformer applications
• – Industrial voltage transformation
• – Applications requiring higher-rated single-phase transformer solutions

Control Transformer	Class 1 Isolation Transformer with Earth Screen between Primary and Secondary
Standard	IEC / BS-EN 61558
Primary Voltages	To be specified
Secondary Voltages	To be specified
Frequency	50/60Hz
Insulation Class	B, F or H
Insulation Resistance	> 5 Meg Ω
Dielectric Strength	Primary to Secondary >2.5kV Primary to Earth >2.5kV Secondary to Earth >2.5kV
Ambient Temperature	40℃

Transformer Circuit Protection

Transformers must be protected against short circuit and overload.

Primary Circuit

The primary side of the Transformer should be protected against short circuit thereby cutting the supply voltage in the event of a short circuit fault.

The rating of the primary protection device has to take into account the high inrush current during energizing of the Transformer.

The table below gives suggested protection values to avoid nuisance tripping on inrush.

Rating VA	Primary Volts	Amps	Fuse	Type C MCB	Type D MCB	Primary Volts	Amps	Fuse	Type C MCB	Type D MCB
3000	230	13.04	20	40	25	415	7.22	12	25	16
4000	230	17.39	25	63	32	415	9.63	16	40	20
5000	230	21.7	32	63	32	415	12.04	20	40	20
7500	230	32.60	50	63	32	415	18.07	32	40	25
10000	230	43.47	63	100	50	415	24.09	40	50	32
15000	230	65.21	110		63	415	36.14	63		40
20000	230	86.95	150			415	48.19	75		50
30000	230	130.43	200			415	72.28	110
40000	230	173.91	300			415	96.38	175

Secondary Circuit

The secondary circuit should be protected against short circuit and overload.

The value of the protection should be the same or less than the rated output current.

Part No. VA	A	B	C	D	E	Weight kg	% Reg.	Watts Loss	Inrush VA For 10% Volt drop	Inrush VA For 5% Volt drop
CL3000	200	115	275	160	85	20	3.4	160	11800	7400
CL4000	200	135	275	160	105	25	3.4	170	15700	9800
CL5000	240	140	390	200	100	40	3.1	180	25000	15000
CL7500	240	160	390	200	120	50	3.0	210	43000	25700
CL10000	280	230	440	240	130	70	2.9	254	50000	35000
CL15000	280	260	440	240	170	100	1.9	350
CL20000	320	320	490	280	200	130	1.9	560
CL30000	400	350	690	300	170	190	1.8	950
CL40000	400	350	690	300	180	225	1.8	1100

Related Control Transformer Ranges

Need a smaller CL control transformer? View our CL 50VA–2.5kVA range for lower-rated control circuit applications.

For a wider overview of our control transformer capability, visit our Control Transformers page.