Hammond 187D28 28V CT 30VA Chassis Mount Power Transformer
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Create Free Business AccountKey Features
- 28V C.T. secondary at 1.07 A, rated 30 VA
- Single 115 VAC primary, 50/60 Hz operation; dual-primary version is 186D28
- 3.25 in (83 mm) L x 1.68 in (43 mm) D x 1.93 in (49 mm) H, 2.81 in (71 mm) mounting centers
- Combination solder or quick connect terminals
- Split bobbin construction, no electrostatic shield needed
- Hi-pot tested to 2 KV RMS; Class B (130 °C) insulation
- UL listed (# E207860) Type 3AH and CSA Certified; RoHS and REACH compliant
With a 28 V center-tapped secondary at 1.07 A, the 187D28 provides 30 VA from a single 115 VAC primary. It belongs to the 187 series of chassis-mount, low-voltage power transformers, which run on 50/60 Hz and suit OEM engineers and panel builders who need a fixed step-down secondary with a center tap. If you need a dual 115/230 VAC primary with the same secondary, the ordering table pairs this part with the 186D28.
Construction is an economical open-style channel frame for chassis mounting. Split bobbin construction removes the need for an electrostatic shield, insulation is Class B (130 °C), and temperature rise is designed not to exceed Class A for longer life. Combination solder or quick connect terminals allow either soldered leads or quick connect wiring.
In the D-size frame, the 187D28 measures 3.25 in (83 mm) long, 1.68 in (43 mm) deep not including terminals (2.06 in (52 mm) to the terminal), and 1.93 in (49 mm) high, with 2.81 in (71 mm) mounting centers. Shipping weight is 1.1 lbs (0.50 kg).
The series is hi-pot tested to 2 KV RMS, UL listed (# E207860) Type 3AH and CSA Certified. This part is listed as RoHS and REACH compliant.
Ideal For
- Chassis-mounted 28V center-tapped supplies from a 115 VAC line
- OEM equipment power sections needing a 50/60 Hz step-down transformer
- Builds wired with solder or quick connect terminals
- Designs rated around 30 VA
Overview
| Series | 187 Series (single primary); 186-187 Series family |
| Product Type | Power transformer, chassis mount |
| Long Description | Transformer, chassis mount, 115VAC, 30VA, 28V C.T.@1.07A, 187 Series |
| Short Description | TX 115VAC, 30VA 50/60HZ |
| Construction Style | Open style, channel frame - chassis mount |
| Dual-Primary (115/230 VAC Equivalent | 186D28 |
Dimensions
| Height (C) | 1.93 in (49 mm) |
| Length (L) | 3.25 in (83 mm) |
| Mounting Centers (D) | 2.81 in (71 mm) |
| Depth To Terminal (E) | 2.06 in (52 mm) |
| Depth, Not Including Terminals (B) | 1.68 in (43 mm) |
Electrical
| Frequency | 50/60 Hz |
| Power Rating | 30 VA |
| Primary Voltage | 115 VAC (single primary) |
| Secondary Current | 1.07 A |
| Hi-Pot Test (Series) | 2 KV RMS |
| Secondary Voltage (RMS) | 28V C.T. |
Identifiers
| UPC | 623980761244 |
| UNSPSC | 39121301 |
| Part Number | 187D28 |
Packaging & Shipping
| Shipping Weight | 1.1 lbs (0.50 kg) |
Construction & Finish
| Bobbin | Split bobbin construction (eliminates the need for an electrostatic shield) |
| Terminals | Combination solder or quick connect |
| Insulation Class | Class B (130 °C) |
| Temperature Rise | Designed not to exceed Class A |
Compliance & Certifications
| UL | UL listed (# E207860) Type 3AH |
| CSA | CSA Certified |
| RoHS Compliant | Yes |
| REACH Compliant | Yes |
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Frequently Asked Questions
What are the output ratings of the 187D28?▾
The 187D28 has a 28V C.T. (center-tapped) RMS secondary rated 1.07 A, for 30 VA, from a 115 VAC primary at 50/60 Hz.
Is there a 230 VAC version of the 187D28?▾
Yes. The ordering table lists 186D28 as the dual-primary 115/230 VAC part with the same 28V C.T. secondary and 1.07 A rating. The 187D28 is the single-primary 115 VAC version.
What are the mounting dimensions of the 187D28?▾
It measures 3.25 in (83 mm) long, 1.68 in (43 mm) deep not including terminals, 2.06 in (52 mm) deep to the terminals and 1.93 in (49 mm) high, with mounting centers of 2.81 in (71 mm).
How are connections made?▾
The transformer has combination solder or quick connect terminals, so leads can be soldered or fitted with quick connect terminals.
What approvals does the 187D28 carry?▾
The 186-187 series is UL listed (# E207860) Type 3AH and CSA Certified, and this part is listed as RoHS and REACH compliant.
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