Hammond 266M6 18.9VA Filament Transformer, 6.3V C.T. at 3A
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- 18.9 VA rating: 6.3V @ 3A series (C.T.) or 3.15V @ 6A parallel
- Dual primary for 117 VAC (parallel) or 234 VAC (series), 50/60 Hz
- Dual secondaries: center-tapped, parallel connected or used individually
- Factory test data on drawing: 50 mA max excitation current at 117V, 60Hz
- 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
- Open-style chassis mount, mounting style A, minimum 6" leads
- UL listed (# E207860) Type 3AH, CSA certified (209651), RoHS and REACH compliant
The 266M6 is an 18.9 VA filament and low-voltage transformer rated 6.3 V center tapped at 3 A, or 3.15 V at 6 A in parallel, for chassis builds needing a 6.3 V winding with more current than the smaller 6.3 V models. It belongs to the Hammond 266 Series of low voltage/filament transformers and is aimed at OEM engineers, repair technicians and panel builders who mount the transformer directly to a chassis.
The primary is a dual 117/234 VAC, 50/60 Hz winding: connect the two primary halves in parallel for 117 V or in series for 234 V. The dual secondaries can be used as a center-tapped secondary (6.3V @ 3A), connected in parallel (3.15V @ 6A) or used individually, and the unit is designed for use with all windings engaged.
Construction is open style with a dual bobbin design, so no electrostatic shield is required. Hammond uses Class B (130 °C) insulation for extra protection, while the design is UL listed as Class A (105 °C). Every unit is hi-pot tested at 2,000V RMS, and all leads are a minimum of 6 in long. The transformer is UL listed (# E207860) Type 3AH, CSA certified (209651), and RoHS and REACH compliant.
The 266M6 uses mounting style A with 0.19 in (5 mm) mounting holes. Its listed dimensions are A 3.25 in (83 mm), B 2.06 in (52 mm), C 2.00 in (51 mm) and D 2.81 in (71 mm). It weighs 1.15 lbs and ships at 1.3 lbs (0.59 kg).
Ideal For
- 6.3 V filament supply at 3 A
- Chassis-mount low voltage/filament power supply
- Equipment built for either 117 VAC or 234 VAC, 50/60 Hz mains
- Center-tapped, parallel or dual independent secondary outputs
Mounting
| Mounting Style | A |
| Mounting Hole Width | 0.19 in (5 mm) |
| Mounting Hole Diameter (Drawing) | Ø0.187" ±0.015 |
Overview
| Series | 266 Series |
| Product Type | Power transformer, low voltage/filament, dual primary & secondary |
| Long Description | Power transformer, chassis mount, 18.9VA, 6.3V @ 3A or 3.15V @ 6A, 266 Series |
| Short Description | POWER TX 6.3V ,18.9VA |
| Construction Style | Open style, chassis mount |
Dimensions
| Dimension A | 3.25 in (83 mm) |
| Dimension B | 2.06 in (52 mm) |
| Dimension C | 2.00 in (51 mm) |
| Dimension D | 2.81 in (71 mm) |
| Dimension A (Drawing, With Tolerance) | 3.250" ±0.063 |
| Dimension D (Drawing, With Tolerance) | 2.813" ±0.063 |
Electrical
| Primary | 117/234 VAC, 50/60 Hz (dual primary) |
| Hi-Pot Test | 2,000V RMS |
| Winding Use | Designed for use with all windings engaged |
| Power Rating (VA) | 18.9 |
| Primary Lead Colours | Black, White, Brown, Orange |
| Label Winding Markings | BLK-WHT: 117V 18.9VA; BRN-ORG: 117V 50/60Hz; RED-BLU: 3.15V 3A; GRY-YEL: 3.15V 3A |
| Secondary Lead Colours | Red, Blue, Grey, Yellow |
| Secondary Configuration | Dual secondaries; usable as a center-tapped secondary, parallel connected or individually |
| 117 V Primary Connection | Connect Black to Brown and Orange to White; apply 117 VAC between Black and Orange |
| 234 V Primary Connection | Connect White to Brown; apply 234 VAC between Black and Orange |
| Primary Wiring For 117 V | Parallel connection of primaries |
| Primary Wiring For 234 V | Series connection of primaries |
| Secondary VAC (RMS), Parallel | 3.15V @ 6A |
| Secondary VAC (RMS), Series (C.T.) | 6.3V @ 3A |
Identifiers
| UPC | 623980809366 |
| UNSPSC | 39121301 |
| Part Number | 266M6 |
| Label Marking | MADE IN CANADA |
Electrical Test Data
| DCR, Red-Blue | 71 mOhm ±20% |
| DCR, Black-White | 59.51 Ohm ±20% |
| DCR, Grey-Yellow | 86 mOhm ±20% |
| DCR, Brown-Orange | 69.60 Ohm ±20% |
| Hipot, Primary-Secondary | 2000V, 60Hz, 1 sec |
| No-Load Voltage, Red-Blue | 3.652 V ±2% |
| No-Load Voltage, Grey-Yellow | 3.652 V ±2% |
| No-Load Voltage, Brown-Orange | 117.0 V ±2% |
| Secondary No-Load Voltage Test Condition | 117V, 60Hz on Black-White |
| Excitation Current (117V, 60Hz, Black-White) | 50 mA max |
Packaging & Shipping
| Unit Weight | 1.15 lbs |
| Shipping Weight | 1.3 lbs (0.59 kg) |
Construction & Finish
| Leads | Minimum 6" (6.00 in) long leads |
| Bobbin | Dual bobbin design - no electrostatic shield required |
| Insulation | Class B (130 °C); UL listed as a Class A (105 °C) design |
Compliance & Certifications
| UL | UL listed (# E207860) Type 3AH |
| CSA | CSA certified (209651) |
| RoHS Compliant | Yes |
| REACH Compliant | Yes |
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Frequently Asked Questions
How is the 266M6 primary wired for 117 V or 234 V?▾
Per the assembly drawing: for 234 V connect WHITE to BROWN and apply 234 VAC between BLACK and ORANGE; for 117 V connect BLACK to BROWN and ORANGE to WHITE, then apply 117 VAC between BLACK and ORANGE.
Can the 266M6 run on 234 V as well as 117 V?▾
Yes. The primary is rated 117/234 VAC, 50/60 Hz. Wire the two primary windings in parallel for 117 V or in series for 234 V.
What are the dimensions and weight of the 266M6?▾
Mounting style A; dimensions A 3.25 in (83 mm), B 2.06 in (52 mm), C 2.00 in (51 mm), D 2.81 in (71 mm). Unit weight is 1.15 lbs; shipping weight is 1.3 lbs (0.59 kg).
What certifications does the 266M6 carry?▾
The 266 Series is UL listed (# E207860) Type 3AH and CSA certified (209651). This part is listed as RoHS compliant and REACH compliant.
Does it need an electrostatic shield?▾
No. The dual bobbin design means no electrostatic shield is required.
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