Hammond 183K28-BULK 56VA 28V Center-Tapped PCB Transformer, Bulk Pack
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224-955-1644Key Features
- 56VA rating: 28V C.T. @ 2A with secondaries in series
- 14V @ 4A with secondaries connected in parallel
- Bulk pack part number for the 183K28
- Dual primary for 115 or 230 VAC, 50/60 Hz operation
- Dual non-concentric secondaries: series, parallel or used separately
- Class F (155 degrees C) insulation and 4,000V RMS hipot
- PCB mount, industry standard pin spacing, four hole #6 screw mounting (screws not provided)
- cUL listed; RoHS and REACH compliant
The 183K28-BULK is a 56VA low voltage power transformer for printed circuit board mounting, part of the 183 Series of universal PCB transformers. It is aimed at OEM engineers and electronics designers who need an isolated low-voltage AC supply on a board that must run from either 115 or 230 VAC mains at 50/60 Hz.
183K28-BULK is the bulk pack part number the 183 Series ordering table lists beside the 183K28; it shares the 56VA, 28V C.T. @ 2A (series) and 14V @ 4A (parallel) rating. The dual winding secondaries are non-concentrically wound and can be wired in series, in parallel or used separately; when they are connected in series (pin 9 to pin 10) that junction acts as the center tap.
Construction is a low profile split bobbin with a top shroud, Class F insulation rated 155 degrees C and a 4,000V RMS hipot. Low primary-to-secondary coupling means no electrostatic shield is required. The body measures 3.00 in long, 2.50 in wide and 1.81 in high, with a listed unit weight of 1.7 lbs for the 56VA size; the shipping weight is 1.59 lbs (0.72 kg).
The transformer uses P.C. board pins on industry standard spacing, with 0.045 in square pins and four hole mounting for #6 screws (mounting screws not provided). It is cUL listed, and RoHS and REACH compliant.
Ideal For
- Low-voltage AC supply on printed circuit boards
- 28V center-tapped or 14V secondary supply for board-level electronics
- Equipment that must operate on 115 or 230 VAC, 50/60 Hz mains
- OEM power supply sections needing low primary-to-secondary coupling
Mounting
| Mounting Type | P.C. board mount with industry standard pin spacing |
| Mounting Holes | Four hole mounting (56VA size); mounting screws not provided |
| Mounting Screw | #6 |
| Pin Size (Square) | 0.045 in |
Overview
| Series | 183 Series (Low Voltage PCB Mount - Universal - 2.5 VA to 56 VA) |
| Packaging | Bulk pack part number of the 183K28 |
| Description | Transformer, low voltage PCB mount, 115/230V, 56VA, 28V C.T. @ 2A, 183 Series |
| Product Type | Low voltage PCB mount power transformer |
| Short Description | POWER PCB 56VA 115/230 |
Dimensions
| Width (W) | 2.50 in |
| Height (H) | 1.81 in |
| Length (L) | 3.00 in |
| Dimension A | 0.60 in |
| Dimension B | 0.30 in |
| Dimension C | 1.90 in |
| Dimension N | 2.00 in |
| Dimension P | 2.50 in |
| Unit Weight (56VA Size) | 1.7 lbs |
Electrical
| Hipot | 4,000V RMS |
| Primary | Dual primary, 115 or 230 VAC, 50/60 Hz |
| Center Tap | Secondaries connected in series (pin 9 connected to pin 10) - that connection acts as the C.T. (center tap) |
| Power Rating | 56 VA |
| Secondary Windings | Dual winding secondaries, non-concentrically wound; can be wired in series, parallel or used separately |
| Secondary (RMS), Series | 28V C.T. @ 2A |
| Secondary (RMS), Parallel | 14V @ 4A |
| Primary To Secondary Coupling | Low - no electrostatic shield required |
Identifiers
| UPC | 623980562490 |
| UNSPSC | 39121301 |
| Part Number | 183K28-BULK |
Packaging & Shipping
| Shipping Weight | 1.59 lbs (0.72 kg) |
Construction & Finish
| Construction | Low profile, split bobbin with top shroud design |
| Insulation Class | Class F, 155 degrees C |
Compliance & Certifications
| Listings | cUL |
| RoHS Compliant | Yes |
| REACH Compliant | Yes |
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Frequently Asked Questions
What output does the 183K28-BULK provide?▾
It is rated 56VA: 28V C.T. @ 2A with the two secondaries in series, or 14V @ 4A with them in parallel. The secondaries can also be used separately.
How does 183K28-BULK relate to 183K28?▾
The 183 Series ordering table lists 183K28-BULK as the bulk pack part number for 183K28; both carry the same 56VA, 28V C.T. @ 2A / 14V @ 4A rating. The pack quantity is not stated in the product data.
Can it run on both 115V and 230V mains?▾
Yes. It has a dual primary for 115 or 230 VAC, 50/60 Hz operation.
Where is the center tap?▾
When the secondaries are connected in series (pin 9 connected to pin 10), that connection acts as the C.T. (center tap).
How is it mounted?▾
It is a P.C. board mount transformer with industry standard pin spacing and 0.045 in square pins, plus four hole mounting for #6 screws. Mounting screws are not provided.
What are the dimensions and weight of the 183K28-BULK?▾
It is 3.00 in long, 2.50 in wide and 1.81 in high, with a listed unit weight of 1.7 lbs for the 56VA size. Shipping weight is 1.59 lbs (0.72 kg).
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