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Control Transformer · 100 VA · 120/240V to 12/24V · Open Style · Delta DCO100HC
SKU: DE-DCO100HC
100 VA open style control transformer for stepping 120/240V down to 12/24V in HVAC panels, control boards, and other single-phase control circuits. Typical use is supplying low-voltage control power where isolated secondary voltage and compact panel fit matter.
What this product is for
The Delta DCO100HC is a single-phase open style control transformer rated 100 VA. It is used to convert 120/240V primary power to 12/24V secondary control power for HVAC equipment, control panels, relays, contactors, and similar low-voltage control circuits.
Use for
- HVAC control circuits requiring 12V or 24V AC
- Replacement of an existing 100 VA open core and coil control transformer
- Panel builds where 120/240V primary and 12/24V secondary taps are required
- Commercial and industrial control applications using 50/60 Hz power
Avoid for
- Direct line-powering of loads above the transformer VA rating
- Outdoor or washdown locations unless installed in a suitable enclosure
- Applications requiring a factory-enclosed transformer
- Circuits where the exact primary or secondary voltage does not match the available taps
Best for
Best for electricians, HVAC technicians, and panel builders who need a compact open style transformer with common 120/240V primary and 12/24V secondary connections. A 100 VA size is commonly selected where more control capacity is needed than a smaller thermostat transformer can provide.
Installed in
Typically installed in HVAC panels, control cabinets, machinery panels, and OEM equipment. Open style construction is generally used inside a protected enclosure or panel.
Why this product exists
Control transformers provide isolated low-voltage power for control devices while keeping the control circuit separate from the line side. This helps supply stable voltage to coils, relays, and control boards in building and industrial systems.
Compared with similar products
Compared with enclosed control transformers, this open style model is intended for mounting inside another enclosure and can help save space. Compared with lower-VA control transformers, the 100 VA rating can better support multiple control loads or higher inrush demand. Actual load suitability depends on connected devices, inrush current, and control circuit design.
Typical guidance only: control transformer sizing should allow for both sealed load and inrush load, with margin for reliable pull-in of contactors and relays. Actual performance depends on installation conditions, connected components, and local electrical code.
Specifications
- Brand: Delta
- Manufacturer part number: DCO100HC
- Product type: Open style control transformer
- Power rating: 100 VA
- Phase: Single-phase
- Primary voltage: 120/240V
- Secondary voltage: 12/24V
- Frequency: 50/60 Hz
- Secondary output current: 8.33A at 12V, 4.17A at 24V
- Approximate dimensions: 2.99 x 3.74 x 2.85 in (about 76 x 95 x 72 mm)
- Mounting slot: 0.22 x 0.44 in (about 6 x 11 mm)
- Approximate ship weight: 3 lb (about 1.4 kg)
- Construction: Open core and coil style
- Certification: UL Listed, CSA certified, CE marked
- Notes: Primary and secondary voltage links/jumpers supplied standard
- Dimensions2.99 x 3.74 x 2.85 in (about 76 x 95 x 72 mm)
- Frequency50/60 Hz
- Wattage100 VA
- PhaseSingle-phase
- Primary Voltage120/240V
- Secondary Voltage12/24V
- Approximate Ship Weight3 lb (about 1.4 kg)
- Mounting Slot0.22 x 0.44 in (about 6 x 11 mm)
- Secondary Output Current8.33A at 12V, 4.17A at 24V
- ApprovalsUL Listed, CSA certified, CE marked
- ConstructionOpen core and coil style
- NotesPrimary and secondary voltage links/jumpers supplied standard
- BrandsDelta Electronics
- Stock in Elmira1
- Stock in Flesherton1
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