Hammond 166N18 18V C.T. 4A 72VA Power Transformer
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Create Free Business AccountKey Features
- 72 VA rating with 18 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 4.03 in (102 mm) x 2.25 in (57 mm) x 2.63 in (67 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 166N18 is a low voltage/filament power transformer from the 166 Series, rated 72 VA with a 115V 60 Hz. primary and a 18 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. The 166N18 steps 115V 60 Hz down to 18 V C.T. at 4 A, a 72 VA rating, in a frame with a 4.03 in (102 mm) A dimension.
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 4.03 in (102 mm), B 2.25 in (57 mm) and C 2.63 in (67 mm), with a D dimension of 3.56 in (90 mm) and 0.19 in (5 mm) mounting holes (mounting reference C). The shipping weight is 1.4 lbs (0.64 kg).
The 166 Series is UL listed and CSA certified, and the 166N18 is marked RoHS compliant and REACH compliant. Identifiers include UPC 623980474724 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 18 V AC supply from a 115V 60 Hz line
- Filament and low voltage transformer applications
- 72 VA chassis-mounted power supplies in OEM equipment
- Circuits that need a center-tapped secondary
Mounting
| Dimension D | 3.56 in (90 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 transformer, low voltage, 115V 60 Hz., 72VA, 18 C.T., 4A |
| Part Number | 166N18 |
| Product Type | Power transformer, low voltage |
| Short Description | POWER |
Dimensions
| Overall Dimension A | 4.03 in (102 mm) |
| Overall Dimension B | 2.25 in (57 mm) |
| Overall Dimension C | 2.63 in (67 mm) |
Electrical
| Hi-Pot Test | 2,000V RMS |
| Power Rating | 72 VA |
| Winding Design | Dual bobbin - no electrostatic shield required |
| Primary Voltage | 115V 60 Hz. |
| Secondary Current (RMS) | 4 A |
| Secondary Voltage (RMS) | 18 C.T. VAC |
Identifiers
| UPC | 623980474724 |
| 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 166N18?▾
The 166N18 has a 115V 60 Hz. primary and a 18 V center-tapped secondary (RMS) rated 4 A, for a power rating of 72 VA.
Can the 166N18 run on 50 Hz power?▾
The 166N18 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 166N18?▾
The series ordering table lists overall dimensions A 4.03 in (102 mm), B 2.25 in (57 mm) and C 2.63 in (67 mm), D 3.56 in (90 mm), with 0.19 in (5 mm) mounting dimensions (mounting reference C). Shipping weight is 1.4 lbs (0.64 kg).
How is the 166N18 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 166N18 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 166N18 is also RoHS and REACH compliant.
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