Single-Phase Lighting Step Down Control Transformer Manufacturer

JMB Single-Phase Portable Lighting Step Down Control Transformer 25Va~50Kva

The JMB series is our rugged, portable single-phase control transformer built for lighting and small industrial equipment. It steps down common mains voltages to isolated, Safety Extra-Low Voltage (SELV) outputs — ideal for damp job sites, confined spaces and metal enclosures where safety matters. Available from 25 VA up to 50 kVA, with multiple taps and optional protective features.

Key features

Single-phase step-down isolation transformer for lighting and control circuits.
Standard SELV secondary voltages: 12V, 24V, 36V, 110V (custom taps available).
IEC Products
Primary voltages: commonly 220/230/380 V; other primaries up to 500 V on request.
Frequency: 50/60 Hz — suitable for international use.
Compact, portable steel enclosure with handles or lifting rings — easy to move between sites.
Built-in overload protection (fuses or automatic breakers) to guard against short-circuits and overloads.
Effective thermal design with large ventilation openings — designed for stable long-term operation (temperature rise per model).

Product Description

Model	primary voltage(V)	secondary voltage(V)	Mounting Dimensions voltage(V)	Mounting holes(K*J)	Dimensions voltage(BDE)
JMB-25VA	220/380 or according to user needs	6.3/12/24/36/110/127/220/380 or according to user needs	62.5*46	5*7	807583
JMB-50VA			70*60	6*8	888693
JMB-100VA			84*64	6*8	10597110
JMB-150VA			84*75	6*8	105105110
JMB-200VA			84*86	6*8	105115110
JMB-250VA			102*88	6*10	120120135
JMB-300VA			100*92	6*10	120125135
JMB-400VA			110*103	7*10	135138150
JMB-500VA			107*107	7*10	135140150
JMB-700VA			126*106	7*10	153146160
JMB-1000VA			126*126	7*10	153166160
JMB-1500VA			135*150	6*10	180200190
JMB-2000VA			155*160	8*10	200250220
JMB-3000VA			155*190	8*10	200280220
JMB-5000VA			200*190	8*11	230330260

Selection tips

For portable task lighting near water or metal, choose a SELV secondary (12–36 V) to reduce shock risk. IEC Products
Match the VA rating to the total lamp load + 20–30% margin for inrush/extra fixtures.
If you’ll use the unit outdoors or in dusty/wet sites, request a higher IP rating and corrosion-resistant finish. IEC
Need longer run lengths or special voltages? Ask about custom taps and secondary paralleled outputs

FAQ

Q1 — What affects the control transformer price?
A: Power rating (VA/kVA), primary/secondary voltages, IP/coil insulation class, required certifications and order quantity — all change the price. Small 25 VA units are inexpensive; 50 kVA custom units cost more. Send your specs and we’ll quote.

Q2 — Is the JMB safe for wet/damp workplaces?
A: Yes — when specified with SELV outputs and an appropriate IP rating. SELV isolation helps protect operators, and higher IP enclosures protect the unit from water ingress. IEC Products+1

Q3 — What about temperature rise and long-term use?
A: Typical dry-type transformers have temperature-rise limits defined by industry standards (model and insulation class determine exact figures). We test each unit and provide the temperature-rise data on the datasheet.

Need a quote or a custom spec? Contact our sales team with your required VA, primary/secondary voltages, IP rating and quantity — we’ll recommend the right JMB model and send a fast, detailed quote.