Hammond 166MS 5V C.T. 3A 15VA Power Transformer
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Create Free Business AccountKey Features
- 15 VA rating with 5 V center-tapped secondary at 3 A RMS
- 115V 60 Hz. single primary
- Open style, channel bracket, two hole chassis mount (mounting ref C)
- Overall 3.25 in (83 mm) x 1.75 in (44 mm) x 2.00 in (51 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 166MS is a low voltage/filament power transformer from the 166 Series, rated 15 VA with a 115V 60 Hz. primary and a 5 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 166MS is a 5 V center-tapped, 3 A transformer rated 15 VA, and at 1 lb (0.45 kg) it is one of the lighter parts in this group.
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. The drawing schematic shows black primary leads, green secondary leads and a green/yellow center tap.
Overall dimensions from the series ordering table are A 3.25 in (83 mm), B 1.75 in (44 mm) and C 2.00 in (51 mm), with a D dimension of 2.81 in (71 mm) and 0.19 in (5 mm) mounting holes (mounting reference C). The shipping weight is 1 lbs (0.45 kg). The part drawing gives the mounting hole size as 0.187 in / 4.7 mm width-wise.
The 166 Series is UL listed and CSA certified, and the 166MS is marked RoHS compliant and REACH compliant. Identifiers include UPC 623980241869 and UNSPSC 39121301. If you need 117/234V or 50/60 Hz operation or dual secondaries, the manufacturer points to its 266 Series instead.
Ideal For
- Low voltage 5 V AC supply from a 115V 60 Hz line
- Filament and low voltage transformer applications
- 15 VA chassis-mounted power supplies in OEM equipment
- Circuits that need a center-tapped secondary
Mounting
| Mounting Style | Open style, channel bracket, two hole chassis mount |
| Mounting Reference | C |
| Mounting Dimensions | 0.19 in (5 mm) |
| Mounting Hole Size, Width-wise | 0.187 in / 4.7 mm |
| Hole-to-Hole Mounting Dimension D | 2.81 in (71 mm); drawing 2.81 in / 71.4 mm |
Overview
| Series | 166 Series - Low Voltage/Filament, Economical Single Primary |
| Description | Power transformer, low voltage, 115V 60 Hz., 15VA, 5 C.T., 3A |
| Part Number | 166MS |
| Product Type | Power transformer, low voltage |
| Short Description | POWER TX 115VAC - 5V@3A |
Dimensions
| Overall Dimension A | 3.25 in (83 mm); drawing 3.25 in / 82.6 mm |
| Overall Dimension B | 1.75 in (44 mm); drawing 1.75 in / 44.5 mm |
| Overall Dimension C | 2.00 in (51 mm); drawing 2 in / 50.8 mm |
Electrical
| Hi-Pot Test | 2,000V RMS |
| Power Rating | 15 VA |
| Winding Design | Dual bobbin - no electrostatic shield required |
| Primary Voltage | 115V 60 Hz. |
| Secondary Current (RMS) | 3 A |
| Secondary Voltage (RMS) | 5 C.T. VAC |
Identifiers
| UPC | 623980241869 |
| UNSPSC | 39121301 |
Packaging & Shipping
| Shipping Weight | 1 lbs (0.45 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 166MS?▾
The 166MS has a 115V 60 Hz. primary and a 5 V center-tapped secondary (RMS) rated 3 A, for a power rating of 15 VA.
Can the 166MS run on 50 Hz power?▾
The 166MS is specified for a 115V 60 Hz primary. For 117/234V or 50/60 Hz operation, the manufacturer recommends its 266 Series.
What size is the 166MS?▾
The series ordering table lists overall dimensions A 3.25 in (83 mm), B 1.75 in (44 mm) and C 2.00 in (51 mm), D 2.81 in (71 mm), with 0.19 in (5 mm) mounting dimensions (mounting reference C). Shipping weight is 1 lbs (0.45 kg).
How is the 166MS mounted and wired?▾
It is an open style, channel bracket, two hole chassis mount transformer with leads a minimum of 6 in long; the drawing shows black primary leads, green secondary leads and a green/yellow center tap.
What safety approvals does the 166MS 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 166MS is also RoHS and REACH compliant.
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