Hammond 270DBX 86 VA 115/125V Plate Transformer, 500V C.T. 115mA
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Create Free Business AccountKey Features
- 86 VA rating; 500V C.T. @ 115mA RMS high voltage (plate) secondary
- 115/125 VAC primary, 60 Hz dual-tap (gray 115V, black 125V leads)
- Filament windings: 5V @ 2A and 6.3V @ 3A
- Enclosed, 4 hole, chassis mount in the vertical (X) style, 2.50 in (64 mm) x 3.06 in (78 mm)
- Runs full wave bridge or full wave C.T.
- Hi-pot 2500V, 60 Hz, 1 sec primary to secondary; leads 9.0 in min, stripped 0.5 in
- CSA certified (209651); RoHS and REACH compliant
- Shipping weight 3.1 lbs (1.41 kg)
The 270DBX is an 86 VA high voltage (plate) and filament power transformer with a dual-tap 115V/125VAC, 60 Hz primary. Its part drawing documents a 500V center-tapped secondary (250-0-250V) rated at 115 mA, a 5V @ 2A winding and a 6.3V @ 3A winding, with full electrical test data, so engineers can verify it on the bench against published acceptance criteria.
Electrically, the 270DBX is rated 86 VA with a 115/125 VAC, 60 Hz primary, a high voltage secondary rated 500V C.T. @ 115mA (RMS), and filament windings of 5V @ 2A (#1) and 6.3V @ 3A (#2). As with every 200 Series unit, it can be run full wave bridge or full wave C.T. The drawing (revision 0, released 05/13/25) specifies leads of 9.0 in minimum, stripped 0.5 in, and a primary-to-secondary hi-pot of 2500V, 60 Hz for 1 second.
Construction is an enclosed, 4 hole, chassis mount design in the vertical (X) mounting style. The drawing gives case dimensions of A 2.500 in, B 3.060 in, C 3.046 in, D 2.000 in and E 2.063 in, with 0.203 in x 0.375 in mounting slots, and the part ships at 3.1 lbs (1.41 kg). Insulation is Class A (105 degrees C).
Primary leads are white (0V), gray (115V) and black (125V). Use white and gray for a 115 VAC line, or white and black where a higher line voltage of roughly 125V is pushing the secondary too high. Never connect power to both the gray and black wires, since the series notes warn this destroys the transformer instantly. Secondary leads are red/red for the high voltage with a red/yellow center tap, yellow/yellow for 5V and green/green for 6.3V.
Tested acceptance criteria include a maximum excitation current of 281 mA at 125V, 60 Hz and no-load secondary voltages of 531.1V (red to red), 5.405V and 6.757V at plus or minus 2%. The design is CSA certified (209651) and the part is RoHS and REACH compliant.
Ideal For
- High voltage (plate) supply using a full wave bridge rectifier
- Full wave center-tapped (C.T.) rectifier plate supply
- 5V filament supply plus 6.3V filament supply
- Chassis-mounted power supplies on 115/125 VAC, 60 Hz lines
- Installations where roughly 125V line voltage raises the secondary
Mounting
| Leads | All leads 9.0" out min., stripped 0.5" |
| Mounting Type | Vertical ("X") |
| Mounting Style | Enclosed, 4 hole, chassis mount |
| Series Lead Length | Minimum 6" long leads |
Overview
| Series | 200 Series - High Voltage (Plate) & Filament - 32 VA to 454 VA |
| Description | PWR TX. 86VA Pri.: 115V/125VAC, 60Hz, HV Sec. 500VCT 115mA |
| Part Number | 270DBX |
| Product Type | High voltage (plate) and filament power transformer |
| Short Description | 250-0-250V 115mA/5V 2A/6.3V 3A |
Dimensions
| Dimension A | 2.50 in (64 mm) |
| Dimension B | 3.06 in (78 mm) |
| Dimension C | 3.05 in (77 mm) |
| Dimension D | 2.00 in (51 mm) |
| Dimension F | 1.94 in (49 mm) |
| Mounting Slot (G) | 0.20 in (5 mm) x 0.38 in (10 mm) |
| Drawing Dimension A | 2.500" ±0.063 |
| Drawing Dimension B | 3.060" ±0.125 |
| Drawing Dimension C | 3.046" ±0.063 |
| Drawing Dimension D | 2.000" ±0.063 |
| Drawing Dimension E | 2.063" ±0.063 |
| Drawing Mounting Slot G | 0.203" x 0.375" ±0.015 |
Electrical
| Filament #1 | 5V @ 2A |
| Filament #2 | 6.3V @ 3A |
| Power Rating | 86 VA |
| Primary Leads | WHT 0V; GRY 115V; BLK 125V |
| Wiring Caution | Never connect power to both the Gray & Black wire - instantaneous destruction of the transformer will result |
| Primary Voltage | 115/125 VAC |
| Primary Frequency | 60 Hz |
| Primary Winding Note | Production "running change" made to the primary winding, effective with August 2009 production |
| DC Resistance GRN - GRN | 0.061 ±20% @ 20°C |
| DC Resistance RED - RED | 137.7 ±20% @ 20°C |
| DC Resistance WHT - BLK | 3.561 ±20% @ 20°C |
| DC Resistance WHT - GRY | 3.230 ±20% @ 20°C |
| DC Resistance YEL - YEL | 0.074 ±20% @ 20°C |
| Rectifier Configuration | Full wave bridge or full wave C.T. |
| Excitation Current (Iex) | 281mA max. @ 125V, 60Hz, WHT - BLK |
| No-Load Voltage GRN - GRN | 6.757V ±2% |
| No-Load Voltage RED - RED | 531.1V ±2% |
| No-Load Voltage WHT - GRY | 114.9V ±2% (@ 125V, 60Hz, WHT - BLK) |
| No-Load Voltage YEL - YEL | 5.405V ±2% |
| Primary Wiring (115 VAC Input) | White & Gray wires; tape the Black wire |
| AC High Voltage Secondary (RMS) | 500V C.T. @ 115mA |
| Hi-Pot (Primary - Secondary, Drawing) | 2500V, 60Hz, 1 sec |
| Primary Wiring (Approx. 125 VAC Input) | White & Black wires; tape the Gray wire |
| No-Load Voltage RED - RED/YEL = RED/YEL - RED | 265.5V ±2% |
Identifiers
| UPC | 623980241746 |
| UNSPSC | 39121301 |
| Drawing Number | 270DBX (Rev. 0, released 05/13/25) |
Packaging & Shipping
| Shipping Weight | 3.1 lbs (1.41 kg) |
Construction & Finish
| Enclosure | Enclosed |
| Insulation | Class A insulation (105 degrees C) |
Compliance & Certifications
| Hi-Pot Test | 2,000V RMS |
| RoHS Compliant | Yes |
| REACH Compliant | Yes |
| CSA Certification | CSA certified (209651) |
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Frequently Asked Questions
What voltages does the 270DBX provide?▾
The 270DBX provides a high voltage secondary rated 500V C.T. @ 115mA (RMS) plus filament windings of 5V @ 2A (#1) and 6.3V @ 3A (#2), from a 115/125 VAC, 60 Hz primary, with a 86 VA rating.
Can the 270DBX be used with a full wave bridge rectifier?▾
Yes. 200 Series units can be run full wave bridge or full wave C.T. (center-tapped).
How do I wire the 270DBX for 115V or 125V line voltage?▾
Primary leads are white (0V), gray (115V) and black (125V). Use white and gray for 115 VAC input, or white and black where roughly 125V line voltage gives too high a secondary; tape the unused lead. Never power both gray and black.
Will the 270DBX work on 50 Hz power?▾
The 270DBX primary is listed at 60 Hz only. The series notes point to the 300 Series for universal primaries and/or 50/60 Hz operation.
What hi-pot and lead specifications apply to the 270DBX?▾
The drawing specifies a primary-to-secondary hi-pot of 2500V, 60 Hz for 1 second and all leads 9.0 in out minimum, stripped 0.5 in. The series is also CSA certified (209651) with Class A (105 degrees C) insulation.
How is the 270DBX mounted and how much does it weigh?▾
It is an enclosed, 4 hole, chassis mount transformer in the vertical (X) mounting style, with dimension A 2.50 in (64 mm) and B 3.06 in (78 mm). Shipping weight is 3.1 lbs (1.41 kg).
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