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One-phase control transformer

One-phase control transformers are essential components in industrial automation and electrical distribution systems, designed to step down primary voltage levels to lower secondary voltages for control circuits, signaling devices, and auxiliary equipment. These transformers typically operate at frequencies of 50/60 Hz and are available in power...

One-phase control transformers are essential components in industrial automation and electrical distribution systems, designed to step down primary voltage levels to lower secondary voltages for control circuits, signaling devices, and auxiliary equipment. These transformers typically operate at frequencies of 50/60 Hz and are available in power ratings ranging from a few VA up to several kVA. They feature robust insulation systems, often with thermal protection, and are constructed with copper or aluminum windings for reliability. Common technical specifications include primary voltages such as 230V, 400V, or 480V, and secondary voltages like 24V, 48V, or 110V, depending on application requirements. In different regions, these devices are also known as control circuit transformers, machine tool transformers, or industrial control transformers, ensuring global recognition for SEO purposes.

These transformers are widely deployed in industrial environments, including control panels, motor control centers (MCCs), programmable logic controller (PLC) cabinets, and automation systems. They are critical in sectors such as manufacturing, process industries, energy generation, and building automation, where they provide isolated and regulated power for relays, contactors, sensors, and human-machine interfaces (HMIs). Their compact design allows for DIN-rail or panel mounting, making them suitable for space-constrained installations in switchboards and distribution boards.

Within the category of one-phase control transformers, key subcategories include encapsulated transformers, open-frame transformers, and toroidal transformers. Notable article codes often follow patterns like CTR-100VA-230/24V or TCT-500VA-400/110V, where the code indicates power rating, primary voltage, and secondary voltage. For example, a common code might be CTR-250VA-400/24V, representing a 250 VA transformer with 400V primary and 24V secondary. Other variants include low-profile models for compact enclosures and high-temperature-rated units for harsh environments.

Partnering with Electric Automation Network ensures access to a comprehensive inventory of one-phase control transformers with real-time pricing and technical documentation. Our engineering team provides personalized support for selection, sizing, and application guidance. We offer express worldwide shipping, ensuring minimal downtime for your projects. Benefit from our expertise in industrial automation and electrical supply to optimize your control systems.

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Manufacturer Code Reference Catalog Number Description Delivery Price

204951

STN0,2(230/230)

Y7-204951

Transformer, control; 200 VA; single Phase; Primary 230 V AC; Secondary 230 V AC

STN0,2(230/230)

Eaton Moeller® series STN Control transformer, 230 V, 0.2 kVA

 		2 View Availability View Price

204940

STN0,1(230/230)

Y7-204940

Transformer, control; 100 VA; single Phase; Primary 230 V AC; Secondary 230 V AC

STN0,1(230/230)

Eaton Moeller® series STN Control transformer, 230 V, 0.1 kVA

 		2 View Availability View Price

204934

STN0,06(230/230)

Y7-204934

Transformer control; 60 VA; single Phase; Primary 230 V AC; Secondary 230 V AC

STN0,06(230/230)

Eaton Moeller® series STN Control transformer, 230 V, 0.06 kVA

 		2 View Availability View Price

026641

STI0,8(230/230)

Y7-26641

Control transformer, 0.8 kVA, Rated input voltage 230± 5 % V, Rated output voltage 230 V

Transformer control; 800 VA; single Phase; Primary: 230 V AC; Secondary: 230 V AC

Eaton Moeller® series STI Control transformer, 0.8 kVA, Rated input voltage 230± 5 % V, Rated output voltage 230 V

 		2 View Availability View Price

026642

STI1,0(230/230)

Y7-26642

Control transformer, 1 kVA, Rated input voltage 230± 5 % V, Rated output voltage 230 V

Transformer, control; 1.0 k VA; single Phase; Primary: 230 V AC; Secondary: 230 V AC

Eaton Moeller® series STI Control transformer, 1 kVA, Rated input voltage 230± 5 % V, Rated output voltage 230 V

 		2 View Availability View Price

029968

STI0,06(230/230)

Y7-29968

Control transformer, 0.06 kVA, Rated input voltage 230± 5 % V, Rated output voltage 230 V

Transformer control; 60 VA; single Phase; Primary: 230 V AC; Secondary: 230 V AC

Eaton Moeller® series STI Control transformer, 0.06 kVA, Rated input voltage 230± 5 % V, Rated output voltage 230 V

 		2 View Availability View Price

029971

STI0,06(400/24)

Y7-29971

Control transformer, 0.06 kVA, Rated input voltage 400± 5 % V, Rated output voltage 24 V

Transformer control; 60 VA; single Phase; Primary: 400 V AC; Secondary: 24 V AC

Eaton Moeller® series STI Control transformer, 0.06 kVA, Rated input voltage 400± 5 % V, Rated output voltage 24 V

 		2 View Availability View Price

029975

STI0,06(400/230)

Y7-29975

Control transformer, 0.06 kVA, Rated input voltage 400± 5 % V, Rated output voltage 230 V

Transformer control; 60 VA; single Phase; Primary: 400 V AC; Secondary: 230 V AC

Eaton Moeller® series STI Control transformer, 0.06 kVA, Rated input voltage 400± 5 % V, Rated output voltage 230 V

 		2 View Availability View Price

029976

STI0,1(230/230)

Y7-29976

Control transformer, 0.1 kVA, Rated input voltage 230± 5 % V, Rated output voltage 230 V

Transformer, control; 100 VA; single Phase; Primary: 230 V AC; Secondary: 230 V AC

Eaton Moeller® series STI Control transformer, 0.1 kVA, Rated input voltage 230± 5 % V, Rated output voltage 230 V

 		2 View Availability View Price

029977

STI0,06(230/24)

Y7-29977

Control transformer, 0.06 kVA, Rated input voltage 230± 5 % V, Rated output voltage 24 V

Transformer control; 60 VA; single Phase; Primary: 230 V AC; Secondary: 24 V AC

Eaton Moeller® series STI Control transformer, 0.06 kVA, Rated input voltage 230± 5 % V, Rated output voltage 24 V

 		2 View Availability View Price

035247

STI0,16(230/230)

Y7-35247

Control transformer, 160VA, 1p, primary 230V, secondary 230V

Transformer control; 160 VA; single Phase; Primary: 230 V AC; Secondary: 230 V AC

Eaton Moeller® series STI Control transformer, 0.16 kVA, Rated input voltage 230± 5 % V, Rated output voltage 230 V

 		2 View Availability View Price

035248

STI0,2(230/230)

Y7-35248

Control transformer, 200VA, 1p, primary 230V, secondary 230V

Transformer, control; 200 VA; single Phase; Primary: 230 V AC; Secondary: 230 V AC

Eaton Moeller® series STI Control transformer, 0.2 kVA, Rated input voltage 230± 5 % V, Rated output voltage 230 V

 		2 View Availability View Price

035249

STI0,25(400/24)

Y7-35249

Control transformer, 250VA, 1p, primary 400V, secondary 24V

Transformer control; 250 VA; single Phase; Primary: 400 V AC; Secondary: 24 V AC

Eaton Moeller® series STI Control transformer, 0.25 kVA, Rated input voltage 400± 5 % V, Rated output voltage 24 V

 		2 View Availability View Price

035250

STI0,315(400/24)

Y7-35250

Control transformer, 315VA, 1p, primary 400V, secondary 24V

Transformer control; 315 VA; single Phase; Primary: 400 V AC; Secondary: 24 V AC

Eaton Moeller® series STI Control transformer, 0.315 kVA, Rated input voltage 400± 5 % V, Rated output voltage 24 V

 		3 View Availability View Price

035251

STI0,4(400/24)

Y7-35251

Control transformer, 400VA, 1p, primary 400V, secondary 24V

Transformer control; 400 VA; single Phase; Primary: 400 V AC; Secondary: 24 V AC

Eaton Moeller® series STI Control transformer, 0.4 kVA, Rated input voltage 400± 5 % V, Rated output voltage 24 V

 		2 View Availability View Price

035252

STI0,5(400/24)

Y7-35252

Control transformer, 500VA, 1p, primary 400V, secondary 24V

Transformer, control; 500 VA; single Phase; Primary: 400 V AC; Secondary: 24 V AC

Control transformer, 0.5 kVA, Rated input voltage 400± 5 % V, Rated output voltage 24 V

 		2 View Availability View Price

035253

STI0,63(400/24)

Y7-35253

Control transformer, 630VA, 1p, primary 400V, secondary 24V

Transformer control; 630 VA; single Phase; Primary: 400 V AC; Secondary: 24 V AC

Eaton Moeller® series STI Control transformer, 0.63 kVA, Rated input voltage 400± 5 % V, Rated output voltage 24 V

 		3 View Availability View Price

035254

STI0,8(400/24)

Y7-35254

Control transformer, 800VA, 1p, primary 400V, secondary 24V

Transformer control; 800 VA; single Phase; Primary: 400 V AC; Secondary: 24 V AC

Eaton Moeller® series STI Control transformer, 0.8 kVA, Rated input voltage 400± 5 % V, Rated output voltage 24 V

 		3 View Availability View Price

035255

STI1,0(400/24)

Y7-35255

Control transformer, 1.0kVA, 1p, primary 400V, secondary 24V

Transformer, control; 1.0 k VA; single Phase; Primary: 400 V AC; Secondary: 24 V AC

Eaton Moeller® series STI Control transformer, 1 kVA, Rated input voltage 400± 5 % V, Rated output voltage 24 V

 		3 View Availability View Price

035256

STI1,3(230/230)

Y7-35256

Control transformer, 1.3kVA, 1p, primary 230V, secondary 230V

Transformer remote control; 1.3 k VA; single Phase; Primary: 230 V AC; Secondary: 230 V AC

Eaton Moeller® series STI Control transformer, 1.3 kVA, Rated input voltage 230± 5 % V, Rated output voltage 230 V

 		2 View Availability View Price

035257

STI1,6(230/230)

Y7-35257

Control transformer, 1.6kVA, 1p, primary 230V, secondary 230V

Transformer control; 1.6 k VA; single Phase; Primary: 230 V AC; Secondary: 230 V AC

Eaton Moeller® series STI Control transformer, 1.6 kVA, Rated input voltage 230± 5 % V, Rated output voltage 230 V

 		3 View Availability View Price

035258

STI2,0(400/230)

Y7-35258

Control transformer, 2.0kVA, 1p, primary 400V, secondary 230V

Transformer control; 2.0 k VA; single Phase; Primary: 400 V AC; Secondary: 230 V AC

Eaton Moeller® series STI Control transformer, 2 kVA, Rated input voltage 400± 5 % V, Rated output voltage 230 V

 		2 View Availability View Price

035259

STI2,5(400/230)

Y7-35259

Control transformer, 2.5 kVA, Rated input voltage 400± 5 % V, Rated output voltage 230 V

Transformer, control; 2.5 k VA; single Phase; Primary: 400 V AC; Secondary: 230 V AC

Eaton Moeller® series STI Control transformer, 2.5 kVA, Rated input voltage 400± 5 % V, Rated output voltage 230 V

 		2 View Availability View Price

035260

STI3,0(400/230)

Y7-35260

Control transformer, 3.0kVA, 1p, primary 400V, secondary 230V

Transformer control; 3.0 k VA; single Phase; Primary: 400 V AC; Secondary: 230 V AC

Eaton Moeller® series STI Control transformer, 3 kVA, Rated input voltage 400± 5 % V, Rated output voltage 230 V

 		2 View Availability View Price

035261

STI4,0(400/230)

Y7-35261

Control transformer, 4.0kVA, 1p, primary 400V, secondary 230V

Transformer control; 4.0 k VA; single Phase; Primary: 400 V AC; Secondary: 230 V AC

Eaton Moeller® series STI Control transformer, 4 kVA, Rated input voltage 400± 5 % V, Rated output voltage 230 V

 		2 View Availability View Price

035262

STI0,25(230/24)

Y7-35262

Control transformer, 250VA, 1p, primary 230V, secondary 24V

Transformer control; 250 VA; single Phase; Primary: 230 V AC; Secondary: 24 V AC

Eaton Moeller® series STI Control transformer, 0.25 kVA, Rated input voltage 230± 5 % V, Rated output voltage 24 V

 		2 View Availability View Price

036392

STI0,315(230/24)

Y7-36392

Control transformer, 315VA, 1p, primary 230V, secondary 24V

Transformer control; 315 VA; single Phase; Primary: 230 V AC; Secondary: 24 V AC

Eaton Moeller® series STI Control transformer, 0.315 kVA, Rated input voltage 230± 5 % V, Rated output voltage 24 V

 		2 View Availability View Price

036393

STI0,4(230/24)

Y7-36393

Control transformer, 400VA, 1p, primary 230V, secondary 24V

Transformer control; 400 VA; single Phase; Primary: 230 V AC; Secondary: 24 V AC

Eaton Moeller® series STI Control transformer, 0.4 kVA, Rated input voltage 230± 5 % V, Rated output voltage 24 V

 		2 View Availability View Price

036394

STI0,5(230/24)

Y7-36394

Control transformer, 500VA, 1p, primary 230V, secondary 24V

Transformer, control; 500 VA; single Phase; Primary: 230 V AC; Secondary: 24 V AC

Eaton Moeller® series STI Control transformer, 0.5 kVA, Rated input voltage 230± 5 % V, Rated output voltage 24 V

 		2 View Availability View Price

036395

STI0,63(230/24)

Y7-36395

Control transformer, 630VA, 1p, primary 230V, secondary 24V

Transformer control; 630 VA; single Phase; Primary: 230 V AC; Secondary: 24 V AC

Eaton Moeller® series STI Control transformer, 0.63 kVA, Rated input voltage 230± 5 % V, Rated output voltage 24 V

 		2 View Availability View Price

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