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Create Free Business AccountThe 187A56 is a 2.5 VA open-style, chassis mount power transformer from the 187 Series with a single 115 VAC primary for 50/60 Hz supplies. The center-tapped secondary delivers 56V C.T. RMS at 0.04 A. It sits in the smallest frame of the 186-187 range, with ratings from 2.34 VA to 2.5 VA across its secondary options. It is aimed at OEM engineers, technicians and equipment builders who need a small low voltage AC source mounted directly to a chassis.
Construction follows the 186-187 Series design: an economical open style, channel frame for chassis mounting, and split bobbin construction that eliminates the need for an electrostatic shield. Insulation material is Class B (130 C), and the design keeps temperature rise from exceeding Class A for longer life. Each unit is hi-pot tested to 2 KV RMS.
Overall length is 2.06 in (52 mm), height is 1.18 in (30 mm) and depth is 1.06 in (27 mm) not including terminals, or 1.44 in (37 mm) measured to the terminals. Mounting centers are 1.75 in (44 mm). Shipping weight is 0.29 lbs (0.13 kg).
Wiring is by combination solder or quick connect terminals. The series ordering table lists no dual 115/230 VAC primary version for this A-frame rating. The series is UL listed (# E207860) Type 3AH and CSA certified, and this part is listed as RoHS and REACH compliant.
| Series | 187 Series (186-187 Series) |
| Description | Transformer, chassis mount, 115VAC, 2.5VA, 56V [email protected], 187 Series |
| Part Number | 187A56 |
| Product Type | Power transformer, low voltage, chassis mount, open style |
| Short Description | TX 115VAC, 2.5VA 50/60HZ |
| Height (C) | 1.18 in (30 mm) |
| Length (L) | 2.06 in (52 mm) |
| Mounting Centers (D) | 1.75 in (44 mm) |
| Depth To Terminal (E) | 1.44 in (37 mm) |
| Depth, Not Including Terminals (B) | 1.06 in (27 mm) |
| Frequency | 50/60 Hz |
| Hi-Pot Test | 2 KV RMS |
| Power Rating | 2.5 VA |
| Primary Voltage | 115 VAC |
| Secondary Current | 0.04 A |
| Primary Configuration | Single Primary 115 VAC |
| Secondary Voltage (RMS) | 56V C.T. |
| UPC | 623980953199 |
| UNSPSC | 39121301 |
| Shipping Weight | 0.29 lbs (0.13 kg) |
| Bobbin | Split bobbin (eliminates need for electrostatic shield) |
| Mounting | Chassis mount, open style channel frame |
| Terminals | Combination solder or quick connect |
| Insulation Class | Class B or 130 C |
| Temperature Rise | Designed not to exceed Class A |
| UL | UL listed (# E207860) Type 3AH |
| CSA | CSA Certified |
| RoHS Compliant | Yes |
| REACH Compliant | Yes |
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It has a single 115 VAC primary and operates on 50/60 Hz.
The secondary is 56V C.T. RMS (center tapped) rated at 0.04 A, for a 2.5 VA power rating.
The series ordering table shows no dual primary version for this A-frame part; dual primary 186 parts start at the B frame.
It is an open style, channel frame chassis mount transformer with 1.75 in (44 mm) mounting centers, and it uses combination solder or quick connect terminals.
No. The series uses split bobbin construction, which eliminates the need for an electrostatic shield.
The 186-187 Series is UL listed (# E207860) Type 3AH and CSA certified, and is hi-pot tested to 2 KV RMS. This part is listed as RoHS and REACH compliant.
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