Hammond VT56A 347V Instrument Potential Transformer, 0-8 VA
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Create Free Business AccountKey Features
- 347V nominal line voltage, 347:120 ratio for 150 Volt full scale A.C. voltmeters
- 1.2% accuracy, 0-8 VA burden, thermal rating 50
- Primary insulated for 4.0 KV rms test for L.V. switchgear and motor control use
- 50/60 Hz operation
- Open construction - "Type H"; Class 105 insulation, 55 degree C rise
- Mounting centers 2.50 in (64 mm) x 2.50 in (64 mm); 0.22 in x 0.44 in mounting slot
- CSA certified (209651); RoHS and REACH compliant
The VT56A is the 347V member of the EX-HX-VT instrument potential transformer family, with a 347:120 ratio. It is the only 347 VAC nominal model in the series, giving a 120 V secondary for driving a voltmeter on 347 VAC systems used in low-voltage switchgear and motor control applications, alongside the 240V, 480V and 600V models in the same family.
Electrically, the VT56A is rated for 50/60 Hz operation with 347:120 primary-to-secondary ratio, 1.2% accuracy, a 0-8 VA burden range and a thermal rating of 50. The primary is insulated for a 4.0 KV rms test, and the insulation system is Class 105 with a 55 degree C rise.
Construction is open "Type H". Overall dimensions are A 3.00 in (76 mm), B 3.25 in (83 mm) and C 2.56 in (65 mm), with mounting centers D and E both 2.50 in (64 mm) and mounting slots of 0.22 in (6 mm) (G) by 0.44 in (11 mm) (H). The spec sheet lists a ship weight of 3 lb; the part page lists 2.35 lbs (1.07 kg).
The VT56A is CSA certified (209651) and listed as RoHS and REACH compliant.
Ideal For
- Voltage metering in low-voltage switchgear
- Motor control centre voltmeter circuits
- Driving 150 Volt full scale A.C. voltmeters on 347 VAC systems
- Panel instrumentation on 50/60 Hz systems
Overview
| Series | EX-HX-VT Series - Potential Transformer Instrument |
| Description | Potential transformer, instrument, 347V, ratio 347:120, VT series |
| Part Number | VT56A |
| Short Description | TRANSFORMER |
Dimensions
| Mounting Slot G | 0.22 in (6 mm) |
| Mounting Slot H | 0.44 in (11 mm) |
| Mounting Centers D | 2.50 in (64 mm) |
| Mounting Centers E | 2.50 in (64 mm) |
| Overall Dimension A | 3.00 in (76 mm) |
| Overall Dimension B | 3.25 in (83 mm) |
| Overall Dimension C | 2.56 in (65 mm) |
Electrical
| VA | 0-8 |
| Frequency | 50/60 Hz |
| Accuracy % | 1.2 |
| Intended Meter | 150 Volt full scale A.C. voltmeter |
| Thermal Rating | 50 |
| Ratio Pri./Sec. | 347:120 |
| Nominal Line Voltage | 347 |
| Primary Insulation Test | 4.0 KV rms |
Identifiers
| UPC | 623980037219 |
| UNSPSC | 39121301 |
Packaging & Shipping
| Shipping Weight | 2.35 lbs (1.07 kg) |
| Ship Weight (Spec Sheet) | 3 lb |
Construction & Finish
| Construction | Open construction - "Type H" |
| Insulation System | 55 degree C rise, Class 105 |
Compliance & Certifications
| RoHS Compliant | Yes |
| REACH Compliant | Yes |
| CSA Certification | CSA certified (209651) |
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Frequently Asked Questions
What voltage systems is the VT56A used on?▾
The VT56A has a 347V nominal line voltage and a 347:120 ratio. The series is used with 150 Volt full scale A.C. voltmeters to measure the voltage of 240, 480 or 600 VAC systems; this model is the 347V version.
What is the accuracy and burden rating of the VT56A?▾
Accuracy is 1.2%, the VA range is 0-8 and the thermal rating is 50.
Is it suitable for switchgear?▾
Yes. The primary is insulated for a 4.0 KV rms test, which the manufacturer states makes it suitable for L.V. switchgear and motor control use.
How is the VT56A mounted?▾
It is an open "Type H" construction with mounting centers of 2.50 in (64 mm) (D) and 2.50 in (64 mm) (E) and 0.22 in (6 mm) by 0.44 in (11 mm) mounting slots.
Is it CSA certified?▾
Yes, CSA certified (209651). It is also listed as RoHS and REACH compliant.
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