Engineering Precision

Industrial Control Transformers (50VA to 25kVA)

An industrial control transformer is an isolation transformer specifically designed to supply electrical control circuits, machine tools, and automation panels requiring consistent secondary voltage with stable regulation during momentary high inrush current periods.

When electromagnetic devices such as contactors, motor starters, relays, and solenoids are energized, they draw high momentary current—frequently 6 to 10 times their sealed holding current. Prima control transformers are engineered with low internal impedance and high magnetic core saturation thresholds to prevent secondary voltage dips that cause relay contact chatter or unexpected dropout.

Manufactured to meet international standards including IEC 61558-2-4, IS 12051, and IS 2026, our transformers deliver galvanic separation and voltage transformation for demanding industrial applications worldwide.

CE Compliant Standards High Inrush Regulation Vacuum Impregnated Custom Taps Available

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Prima Single Phase Industrial Control Transformer — Heavy-duty single phase industrial control transformer with touch-proof terminals

Technical Parameters

Technical Specifications & Constructional Features

Manufactured under strict quality assurance and tested in accordance with international electrotechnical standards.

Design & Performance Specifications

Output VA Rating 50 VA to 25 kVA

Primary / Input Voltage Max. 750 V

Secondary / Output Voltage Max. 750 V

Operating Frequency 50 / 60 Hz

Phase & Vector Group 1 Phase (Single Phase)

Protection Class Class I

Protection Index (IP) IP00 (Enclosures up to IP23)

Insulation Class Class F (155°C)

Ambient Temperature Max. 40°C

Operational Efficiency 80% to 95%

Harmonized Standards IS 12051 / IEC 61558-2-4 / IS 2026 / IS 11171

Heavy-Duty Construction Features

Open Construction Architecture: Standard open configuration rated IP00, with custom ventilated metal enclosures available up to IP23 for demanding environments.
Galvanically Separated Windings: Precision dual-winding design with dielectric insulation barriers to ensure protective galvanic isolation between line and control circuits.
Enhanced Overvoltage Margins: Strict creepage distance and air clearance dimensions engineered to withstand high switching transients and line overvoltages.
Input Primary Matching Taps: Standard off-circuit taps (e.g., ±5% or dual voltage primary) to accommodate regional line voltage variations.
Finger-Safe Connection Terminals: Safe-to-touch screw or screwless industrial terminals according to IEC 61558; heavy clamp-type lugs available upon request.
Vacuum Pressure Impregnation (VPI): Vacuum-impregnated with high-grade polyester resin to eliminate moisture absorption, silent acoustic hum, and enhance thermal dissipation.

Versatile Duty

Target Industrial Applications

Engineered to isolate and step-down voltages across critical machine automation and process control systems.

Control Voltage Circuits

Supplies stable, isolated voltage (such as 24V, 110V, or 230V AC) to contactor coils, safety relays, pushbuttons, indicating lamps, and programmable controllers.

Functional Low Voltage & Instrumentation

Supplies power electronic circuits, sensor conditioning modules, measuring devices, and precision transducers requiring reliable electrical separation from the main bus.

Protective Separation

Protects control personnel and downstream microelectronics from common-mode line noise, switching surges, and inadvertent direct line faults in industrial switchgear and machine tools.

Standard Range & Dimensions

Selection Table: Standard Ratings & Dimensions

Standard physical dimensions, weights, and mounting centers for single-phase control transformers (25VA to 10kVA). Custom dimensions and ratings up to 25kVA are available upon request.

Rating (VA)	Approx. Weight (kg)	Length (mm)	Width (mm)	Height (mm)	Mounting Hole X (mm)	Mounting Hole Y (mm)	Figure Type
25	1.00	56	50	110	46	0	Fig. 1
50	1.80	75	85	125	55	65	Fig. 1
75	2.10	100	75	130	75	55	Fig. 1
100	2.80	100	90	130	75	67	Fig. 1
125	2.80	100	90	130	75	67	Fig. 1
150	3.50	130	85	155	100	67	Fig. 1
200	3.95	130	85	155	100	71	Fig. 1
250	4.60	130	95	155	100	77	Fig. 1
300	4.50	140	95	175	110	64	Fig. 1
400	5.80	140	110	175	110	77	Fig. 1
450	6.40	140	115	175	110	84	Fig. 1
500	8.00	150	110	195	120	85	Fig. 1
550	8.35	150	110	195	120	85	Fig. 1
600	9.20	150	110	195	120	91	Fig. 1
650	10.20	150	115	195	120	98	Fig. 1
700	10.20	150	115	195	120	98	Fig. 1
750	11.10	150	120	195	120	104	Fig. 1
800	11.10	150	120	195	120	104	Fig. 1
1000	12.10	150	130	195	120	110	Fig. 1
1250	14.90	200	130	220	150	80	Fig. 2
1500	17.40	200	140	220	150	92	Fig. 2
1750	19.90	200	150	220	150	105	Fig. 2
2000	17.90	230	120	230	200	96	Fig. 2
2500	21.40	230	140	230	200	109	Fig. 2
3000	23.20	230	140	230	200	115	Fig. 2
3500	28.40	250	150	270	190	110	Fig. 2
4000	32.50	250	170	280	190	124	Fig. 2
4500	35.10	250	170	280	190	129	Fig. 2
5000	37.50	250	180	280	190	136	Fig. 2
5500	38.90	250	190	280	190	142	Fig. 2
6000	42.30	250	195	280	190	148	Fig. 2
6500	44.80	250	200	280	190	155	Fig. 2
7000	51.30	250	220	280	190	175	Fig. 2
7500	57.00	250	240	280	190	192	Fig. 2
8000	58.90	315	180	320	220	130	Fig. 2
9000	60.40	315	180	320	220	130	Fig. 2
10000	66.70	315	190	320	220	142	Fig. 2

Engineering Note: Higher ratings up to 25kVA, customized terminal orientations, dual primary/secondary tapping, and specific sheet-steel enclosures are manufactured to order. Final structural dimensions are confirmed during design verification.

Control Transformer Mounting Diagram - Figure 1

Figure 1: Standard Frame Construction & Mounting Footprint

Control Transformer Mounting Diagram - Figure 2

Figure 2: Heavy-Duty Frame Construction & Mounting Footprint

Need a Custom Control Transformer Solution?

Whether you need custom voltage taps, specific inrush load calculations, tropicalized insulation, or CE test documentation for OEM export, our transformer application team is ready to assist.

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