Hammond 166F12B 12V CT 0.3A Low Voltage Power Transformer
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Create Free Business AccountKey Features
- 3.6 VA rating: 12 VAC center-tapped (C.T.) at 0.3 A secondary (RMS)
- 115V 60 Hz single primary
- Open style channel bracket, two-hole chassis mount
- Class B (130 °C) insulation; UL listed as a Class A (105 °C) design
- Hi-Pot tested at 2,000 V RMS; UL listed and CSA certified
- Dual bobbin design - no electrostatic shield required
- Minimum 6" long leads
- RoHS and REACH compliant; shipping weight 0.4 lbs (0.18 kg)
The Hammond 166F12B is a 3.6 VA low-voltage transformer that steps a 115 V 60 Hz supply down to 12 VAC center-tapped at 0.3 A. Part of the 166 Series of economical single-primary, low-voltage/filament transformers, it is an open-style, chassis-mount design aimed at OEM engineers, electronics designers and repair technicians who need a small, fixed low-voltage AC source inside equipment.
Construction uses a dual bobbin design, so no electrostatic shield is required. Insulation is Class B (130 °C) for extra protection, and the transformer is UL listed as a Class A (105 °C) design. Each unit is Hi-Pot tested at 2,000 V RMS, and the series is UL listed and CSA certified. The 166F12B is also listed as RoHS and REACH compliant.
The series ordering table lists dimensions for the 166F12B of A 2.38 in (60 mm), B 1.38 in (35 mm), C 1.38 in (35 mm) and D 2.00 in (51 mm), with a 0.19 in (5 mm) mounting dimension. Shipping weight is 0.4 lbs (0.18 kg). Mounting is by an open-style channel bracket with two holes for chassis mounting, and the transformer is supplied with minimum 6" long leads.
The primary is rated 115 VAC, 60 Hz. For 117/234 V or 50/60 Hz operation, or for dual secondaries, the manufacturer points to its 266 Series.
Ideal For
- Low-voltage 12 VAC supply inside 115 V 60 Hz equipment
- Center-tapped 12 VAC secondary for split low-voltage circuits
- Filament and low-voltage power in chassis-built electronics
- OEM chassis-mount power sections up to 3.6 VA
Mounting
| Mounting Method | Open style, channel bracket, two hole chassis mount |
| Mounting Dimension | 0.19 in (5 mm) |
| Mounting Reference | C |
Overview
| Style | Open style, chassis mount |
| Series | 166 Series |
| Description | Power transformer, low voltage, 115V 60 Hz., 3.6VA, 12 C.T., 0.3A |
| Part Number | 166F12B |
| Product Type | Power transformer - low voltage/filament |
| Short Description | POWER TX 115VAC - 12V@.3A |
Dimensions
| Dimension A | 2.38 in (60 mm) |
| Dimension B | 1.38 in (35 mm) |
| Dimension C | 1.38 in (35 mm) |
| Dimension D | 2.00 in (51 mm) |
Electrical
| Hi-Pot Test | 2,000 V RMS |
| Power Rating | 3.6 VA |
| Primary Type | Economical single primary |
| Primary Voltage | 115V 60 Hz. |
| Secondary Current (RMS) | 0.3 A |
| Secondary Voltage (RMS) | 12 C.T. VAC |
Identifiers
| UPC | 623980024714 |
| UNSPSC | 39121301 |
Packaging & Shipping
| Shipping Weight | 0.4 lbs (0.18 kg) |
Construction & Finish
| Leads | Minimum 6" long |
| Bobbin Design | Dual bobbin - no electrostatic shield required |
| Insulation Class | 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 output ratings of the 166F12B?▾
The 166F12B is rated 3.6 VA with a secondary of 12 VAC center-tapped (C.T.) at 0.3 A (RMS).
What input voltage does the 166F12B need?▾
It has an economical single primary rated 115 VAC, 60 Hz. For 117/234 V or 50/60 Hz operation, the manufacturer points to its 266 Series.
Is the 166F12B center tapped?▾
Yes. The secondary is listed as 12 C.T. (center tapped).
How is the 166F12B mounted and how big is it?▾
It is an open-style, channel-bracket, two-hole chassis-mount transformer. The series table lists A 2.38 in (60 mm), B 1.38 in (35 mm), C 1.38 in (35 mm) and D 2.00 in (51 mm), with a 0.19 in (5 mm) mounting dimension.
What safety approvals does the 166F12B have?▾
The 166 Series is UL listed (as a Class A, 105 °C design, using Class B 130 °C insulation) and CSA certified, and units are Hi-Pot tested at 2,000 V RMS. The 166F12B is also RoHS and REACH compliant.
How much does the 166F12B weigh?▾
The listed shipping weight is 0.4 lbs (0.18 kg).
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