Bespoke Single Phase Transformers, Single Coil

Single phase transformers constructed on ‘EI’ (single coil) laminations with concentric windings on the coil former(s). Commonly wound over the whole former with a safety earth screen between the windings, alternatively it could be on a split bobbin format without screen. Autotransformers follow a similar construction but have a single winding with no safety earth screen.

• Temperature Rise :- Dependent on size
• Terminals :- Clamp or Stud, Touchproof. Flying leads on request
• Insulation Class :- B as standard for single coil construction. Higher available on request

 

Power Capability :	Generally up to 7.0kVA
Voltages :	Standard up to 690V. Up to 6.6kV available
Insulation Class :	B as standard. Higher on request
Ambient Temp. :	Max 40°C as standard. Others on request
Temperature Rise :	75-80ºC as standard. Others on request
Terminals :	Clamp or Stud, touchproof. Flying leads on request

 

 

 

 

 

Options for open style

• Fuses
• Thermal protection
• Tropical varnish

Transformers can be supplied in a range of enclosures from IP22 to IP65.
Options for enclosed style

• Fuses
• Thermal protection
• MCBs & RCDs
• Plugs & sockets
• Isolators
• Meters

The following table indicates typical sizes of ‘Open Style’ transformers for various power ratings of low voltage units (<700V). Please note these may vary slightly as the specific voltage requirements determine the final transformer design.

For ‘Enclosed Style’ transformers click the box link for a dimensional drawing
Note the inclusion of some optional components may result in a size increase of the indicated enclosure type

 

Rating	A (mm)	B (mm)	C (mm)	T (mm)	Weight (kg)	IP22 Enclosure Name	Click for Drawing
							pdf	dwg
50VA	76	80	65	15	1.0	WM2
75VA	76	80	65	15	1.0	WM2
100VA	100	72	85	15	2.0	WM2
150VA	100	85	75	15	2.0	WM2
200VA	100	85	85	15	3.5	WM2
250VA	120	100	95	20	3.5	WM2
300VA	120	100	95	20	3.75	WM2
400VA	120	100	120	20	4.25	WM2
500VA	140	115	115	20	6.0	WM2
650VA	140	115	125	25	7.25	WM2
750VA	140	115	140	25	8.0	WM2
1.0kVA	170	140	120	25	11	WM3
1.5kVA	170	140	155	25	15	WM3
2kVA	200	170	152	25	20	WM5
2.5kVA	200	170	180	25	26	WM5
3.0kVA	220	180	185	25	30	WM5
4.0kVA	235	200	220	25	35	FM00
5.0kVA	235	196	245	40	40	FM00
6.0kVA	290	250	240	40	55	FM0
7.0kVA	290	250	270	40	65	FM0

Units with voltages greater than 700V up to 6.6KV can be manufactured however the insulation requirements of these transformers will require a larger build size for the specific rating. Some units may convert to the larger dual-coil single-phase transformer construction format.

Instrument transformers manufactured with small VA ratings and low regulation levels for accuracy tend to be manufactured on frame sizes approximately 10 to 20 times their VA rating