Hammond 166N8 8.5V C.T. 4A 34VA Power Transformer
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Create Free Business AccountKey Features
- 34 VA rating with 8.5 V center-tapped secondary at 4 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 2.00 in (51 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 166N8 is a low voltage/filament power transformer from the 166 Series, rated 34 VA with a 115V 60 Hz. primary and a 8.5 V center-tapped (C.T.) secondary rated 4 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. Rated 34 VA, the 166N8 provides 8.5 V C.T. at 4 A from a 115V 60 Hz supply.
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 2.00 in (51 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 1.4 lbs (0.64 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 166N8 is marked RoHS compliant and REACH compliant. Identifiers include UPC 623980224503 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 8.5 V AC supply from a 115V 60 Hz line
- Filament and low voltage transformer applications
- 34 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., 34VA, 8.5 C.T., 4A |
| Part Number | 166N8 |
| Product Type | Power transformer, low voltage |
| Short Description | POWER TX 115VAC - 8.5V@4A |
Dimensions
| Overall Dimension A | 3.25 in (83 mm); drawing 3.25 in / 82.6 mm |
| Overall Dimension B | 2.00 in (51 mm); drawing 2 in / 50.8 mm |
| Overall Dimension C | 2.00 in (51 mm); drawing 2 in / 50.8 mm |
Electrical
| Hi-Pot Test | 2,000V RMS |
| Power Rating | 34 VA |
| Winding Design | Dual bobbin - no electrostatic shield required |
| Primary Voltage | 115V 60 Hz. |
| Secondary Current (RMS) | 4 A |
| Secondary Voltage (RMS) | 8.5 C.T. VAC |
Identifiers
| UPC | 623980224503 |
| UNSPSC | 39121301 |
Packaging & Shipping
| Shipping Weight | 1.4 lbs (0.64 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 166N8?▾
The 166N8 has a 115V 60 Hz. primary and a 8.5 V center-tapped secondary (RMS) rated 4 A, for a power rating of 34 VA.
Can the 166N8 run on 50 Hz power?▾
The 166N8 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 166N8?▾
The series ordering table lists overall dimensions A 3.25 in (83 mm), B 2.00 in (51 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 1.4 lbs (0.64 kg).
How is the 166N8 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 166N8 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 166N8 is also RoHS and REACH compliant.
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