Hammond 166M12B 12.6V C.T. 3A 37.8VA Power Transformer, 50/60 Hz
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Create Free Business AccountKey Features
- 37.8 VA rating with 12.6 V center-tapped secondary at 3 A RMS
- 117V 50/60 Hz. single primary
- Open style, channel bracket, two hole chassis mount (mounting ref C)
- Overall 3.69 in (94 mm) x 2.13 in (54 mm) x 2.31 in (59 mm) (A x B x C)
- Class B (130 °C) insulation; UL listed as a Class A (105 °C) design
- Dual bobbin design - no electrostatic shield required
- Hi-Pot tested at 2,000V RMS; minimum 6 in long leads
- UL listed and CSA certified; RoHS and REACH compliant
The 166M12B is a low voltage/filament power transformer from the 166 Series, rated 37.8 VA with a 117V 50/60 Hz. primary and a 12.6 V center-tapped (C.T.) secondary rated 3 A RMS. It is built for OEM engineers, panel builders and repair technicians who need an open style, channel bracket, two hole chassis mount transformer to derive a low AC voltage inside equipment. The 166M12B is listed in the series ordering table at 37.8 VA with a 117V 50/60 Hz primary and a 12.6 V C.T. secondary at 3 A, in a 3.69 in (94 mm) A-dimension frame.
Construction follows the 166 Series design: a dual bobbin winding arrangement, so no electrostatic shield is required, and Class B insulation (130 °C) for extra protection, with the design UL listed as Class A (105 °C). Each unit is Hi-Pot tested at 2,000V RMS. Leads are a minimum of 6 in long.
Overall dimensions from the series ordering table are A 3.69 in (94 mm), B 2.13 in (54 mm) and C 2.31 in (59 mm), with a D dimension of 3.13 in (80 mm) and 0.19 in (5 mm) mounting holes (mounting reference C). The shipping weight is 1.66 lbs (0.75 kg).
The 166 Series is UL listed and CSA certified, and the 166M12B is marked RoHS compliant and REACH compliant. Identifiers include UPC 623980024790 and UNSPSC 39121301.
Ideal For
- Low voltage 12.6 V AC supply from a 117V 50/60 Hz line
- Filament and low voltage transformer applications
- 37.8 VA chassis-mounted power supplies in OEM equipment
- Circuits that need a center-tapped secondary
Mounting
| Dimension D | 3.13 in (80 mm) |
| Mounting Style | Open style, channel bracket, two hole chassis mount |
| Mounting Reference | C |
| Mounting Dimensions | 0.19 in (5 mm) |
Overview
| Series | 166 Series - Low Voltage/Filament, Economical Single Primary |
| Description | POWER TX 117VAC 12.6V@3A |
| Part Number | 166M12B |
| Product Type | Power transformer, low voltage |
| Short Description | POWER TX 117VAC 12.6V@3A |
Dimensions
| Overall Dimension A | 3.69 in (94 mm) |
| Overall Dimension B | 2.13 in (54 mm) |
| Overall Dimension C | 2.31 in (59 mm) |
Electrical
| Hi-Pot Test | 2,000V RMS |
| Power Rating | 37.8 VA |
| Winding Design | Dual bobbin - no electrostatic shield required |
| Primary Voltage | 117V 50/60 Hz. |
| Secondary Current (RMS) | 3 A |
| Secondary Voltage (RMS) | 12.6 C.T. VAC |
Identifiers
| UPC | 623980024790 |
| UNSPSC | 39121301 |
Packaging & Shipping
| Shipping Weight | 1.66 lbs (0.75 kg) |
Construction & Finish
| Leads | Minimum 6 in long |
| Insulation | Class B (130 °C) |
Compliance & Certifications
| UL | UL listed (as a Class A, 105 °C design) |
| CSA | CSA certified |
| RoHS Compliant | Yes |
| REACH Compliant | Yes |
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Frequently Asked Questions
What are the input and output ratings of the 166M12B?▾
The 166M12B has a 117V 50/60 Hz. primary and a 12.6 V center-tapped secondary (RMS) rated 3 A, for a power rating of 37.8 VA.
Can the 166M12B run on 50 Hz power?▾
Yes. The 166M12B is specified for a 117V 50/60 Hz primary.
What size is the 166M12B?▾
The series ordering table lists overall dimensions A 3.69 in (94 mm), B 2.13 in (54 mm) and C 2.31 in (59 mm), D 3.13 in (80 mm), with 0.19 in (5 mm) mounting dimensions (mounting reference C). Shipping weight is 1.66 lbs (0.75 kg).
How is the 166M12B mounted and wired?▾
It is an open style, channel bracket, two hole chassis mount transformer with leads a minimum of 6 in long.
What safety approvals does the 166M12B have?▾
The 166 Series is UL listed (as a Class A, 105 °C design, while using Class B 130 °C insulation) and CSA certified, and is Hi-Pot tested at 2,000V RMS. The 166M12B is also RoHS and REACH compliant.
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