Hammond 166RS 5V C.T. 8A 40VA Power Transformer
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Create Free Business AccountKey Features
- 40 VA rating with 5 V center-tapped secondary at 8 A RMS
- 115V 60 Hz. single primary
- Open style, channel bracket, two hole chassis mount (mounting ref C)
- Overall 4.50 in (114 mm) x 2.50 in (64 mm) x 3.00 in (76 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 166RS is a low voltage/filament power transformer from the 166 Series, rated 40 VA with a 115V 60 Hz. primary and a 5 V center-tapped (C.T.) secondary rated 8 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 166RS carries the same 5 V C.T., 8 A, 40 VA electrical rating as the 166R5 but in a larger frame: 4.50 in (114 mm) A dimension, 4 in (101.6 mm) hole-to-hole mounting and a 3.5 lb (1.59 kg) shipping weight.
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 4.50 in (114 mm), B 2.50 in (64 mm) and C 3.00 in (76 mm), with a D dimension of 4.00 in (102 mm) and 0.20 in (5 mm) mounting holes (mounting reference C). The shipping weight is 3.5 lbs (1.59 kg). The part drawing gives the mounting hole size as 0.203 in / 5.2 mm width-wise.
The 166 Series is UL listed and CSA certified, and the 166RS is marked RoHS compliant and REACH compliant. Identifiers include UPC 623980241876 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
- 40 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 | 0.20 in (5 mm) |
| Mounting Hole Size, Width-wise | 0.203 in / 5.2 mm |
| Hole-to-Hole Mounting Dimension D | 4.00 in (102 mm); drawing 4 in / 101.6 mm |
Overview
| Series | 166 Series - Low Voltage/Filament, Economical Single Primary |
| Description | Power transformer, low voltage, 115V 60 Hz., 40VA, 5 C.T., 8A |
| Part Number | 166RS |
| Product Type | Power transformer, low voltage |
| Short Description | POWER TX 115VAC - 5V@8A |
Dimensions
| Overall Dimension A | 4.50 in (114 mm); drawing 4.5 in / 114.3 mm |
| Overall Dimension B | 2.50 in (64 mm); drawing 2.5 in / 63.5 mm |
| Overall Dimension C | 3.00 in (76 mm); drawing 3 in / 76.2 mm |
Electrical
| Hi-Pot Test | 2,000V RMS |
| Power Rating | 40 VA |
| Winding Design | Dual bobbin - no electrostatic shield required |
| Primary Voltage | 115V 60 Hz. |
| Secondary Current (RMS) | 8 A |
| Secondary Voltage (RMS) | 5 C.T. VAC |
Identifiers
| UPC | 623980241876 |
| UNSPSC | 39121301 |
Packaging & Shipping
| Shipping Weight | 3.5 lbs (1.59 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 166RS?▾
The 166RS has a 115V 60 Hz. primary and a 5 V center-tapped secondary (RMS) rated 8 A, for a power rating of 40 VA.
Can the 166RS run on 50 Hz power?▾
The 166RS 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 166RS?▾
The series ordering table lists overall dimensions A 4.50 in (114 mm), B 2.50 in (64 mm) and C 3.00 in (76 mm), D 4.00 in (102 mm), with 0.20 in (5 mm) mounting dimensions (mounting reference C). Shipping weight is 3.5 lbs (1.59 kg).
How is the 166RS 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 166RS 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 166RS is also RoHS and REACH compliant.
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