Control Circuit Transformers, 50VA – 2.5kVA | MCL Range

The MCL Range covers control circuit transformers from 50VA to 2.5kVA, designed for industrial control panels, machinery, automation systems and electrical control applications.

Manufactured in the UK by Boardman Transformers, the MCL Range offers 230V and 400V supply options with adjustment tappings, making it suitable for applications where dependable control voltage transformation is required.

These control circuit transformers are designed and manufactured to comply with IEC / BS-EN 61558 and include touch-proof terminals, four-hole fixing access and full varnish impregnation to help protect against humidity.

This high quality product is manufactured using automated winding and welding machines; they offer good access to the four-hole fixing, touch-proof terminals and full varnish impregnation to protect against humidity.

Key Features

• – Control circuit transformer range
• – Ratings from 50VA to 2.5kVA
• – Designed for industrial control panels and machinery
• – 230V and 400V supply options with adjustment tappings
• – Primary voltage configuration: 15-0-15-230-400V
• – Secondary voltage options including 12V, 24V, 48V, 110V and 230V
• – Touch-proof terminals and four-hole fixing access
• – Full varnish impregnation to help protect against humidity
• – Designed and manufactured to comply with IEC / BS-EN 61558
• – UK manufactured by Boardman Transformers

Suitable Applications

The MCL Range is suitable for control circuit applications where reliable voltage transformation and practical installation features are required.

• – Industrial control panels
• – Machinery control circuits
• – Automation systems
• – Panel builders
• – OEM electrical assemblies
• – Manufacturing equipment
• – Control circuit voltage transformation
• – Applications requiring 12V, 24V, 48V, 110V or 230V secondary outputs

Control Transformer	Class 1 Isolation Transformer with Earth Screen between Primary and Secondary
Standard	IEC / BS-EN 61558
Primary Voltages	15-0-15-230-400V
Secondary Voltages	One of the following. 12V, 24V, 48V, 110V, 230V
Frequency	50/60Hz
Insulation Class	B
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
50	230	0.21	1	1	1	415	0.12	500mA	1	1
75	230	0.27	1	1	1	415	0.15	500mA	1	1
100	230	0.43	1	2	1	415	0.24	1	1	1
150	230	0.65	2	2	1	415	0.36	1	1	1
200	230	0.86	2	6	2	415	0.48	1	2	1
250	230	1.09	3.15	6	2	415	0.60	2	2	1
300	230	1.2	3.15	6	3	415	0.72	2	2	2
500	230	2.17	4	10	6	415	1.20	3.15	6	4
750	230	3.26	6	10	6	415	1.80	3.15	6	4
1000	230	4.34	8	10	6	415	2.40	5	6	4
1500	230	6.52	10	16	10	415	3.61	6	10	6
2000	230	8.69	12	16	10	415	4.82	10	10	6
2500	230	10.86	16	25	16	415	6.02	10	16	10

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
MCL25	66	68	77	50	44	0.7	11	6	48	36
MCL50	76	70	86	56	47	1.1	9.8	9	105	77
MCL75	76	76	86	56	53	1.5	8.9	11	135	102
MCL100	84	78	95	64	63	2.1	8.4	14	250	175
MCL150	96	76	102	84	65	2.25	6.7	18	375	260
MCL200	96	86	102	84	72	2.8	5.8	21	550	375
MCL250	96	101	102	84	90	3.7	5.6	27	720	470
MCL300	120	88	122	90	73	4.4	5.3	31	870	585
MCL400	120	100	122	90	85	5.3	5.0	30	1200	790
MCL500	120	120	122	90	106	6.5	4.1	31	1700	1100
MCL750	150	145	140	122	90	8.0	5.2	60	2200	1475
MCL1000	150	161	140	122	106	10.0	3.3	67	4000	2500
MCL1500	150	188	140	122	134	14.0	3.2	88	6200	3850
MCL2000	192	172	180	160	125	20.5	3.3	100	8060	5030
MCL2500	192	192	180	160	153	24.0	2.6	120	12100	7300

Voltage Options and Part Numbers

Winding	Voltage	Code
Primary	15-0-15-230-400V
Secondary	0-12V	J
	0-24V	B
	0-48V	E
	0-110V	F
	0-230V	U

For a 100VA transformer, with an output of 100V, the part number would be MCL100F.

Power Rating Calculation

To choose the size of Transformer required for an application the total inrush VA must be calculated. This figure is then applied to the table above with the maximum allowable voltage drop taken into account. For example, for a calculated inrush of 2,100VA the appropriate transformer is as follows:

1. For 10% drop in output volts during inrush, choose 750VA
2. For 5% drop in output volts during inrush, choose 1000VA

Consideration must also be given to the continuous VA requirement.

Related Control Transformer Ranges

If the MCL Range is not the right fit for your application, Boardman Transformers also manufactures other control transformer ranges for different ratings, specifications and compliance requirements.

View the SCL Range for alternative 50VA to 2.5kVA control circuit transformer options.

View the CL Range for larger single phase control and industrial transformer applications