Hammond VT55A 240V Instrument Potential Transformer, 0-8 VA
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Create Free Business AccountKey Features
- 240V nominal line voltage, 240:120 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
- Nominal 240V may be exceeded by 25% for 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 VT55A is a compact 240V instrument potential transformer in the EX-HX-VT Series. Its 240:120 ratio brings a 240 VAC line down to a level that a 150 Volt full scale A.C. voltmeter can display, making it a practical choice for panel builders adding voltage metering to low-voltage switchgear and motor control equipment.
Electrically, the VT55A is rated for 50/60 Hz operation with 240:120 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. Because its nominal line voltage is 240 volts, the series data allows that nominal to be exceeded by 25% for 60 Hz operation.
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 VT55A 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 240 VAC systems
- Panel instrumentation on 50/60 Hz systems
Overview
| Series | EX-HX-VT Series - Potential Transformer Instrument |
| Description | Potential transformer, instrument, 240V, ratio 240:120, VT series |
| Part Number | VT55A |
| 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. | 240:120 |
| Nominal Line Voltage | 240 |
| Overvoltage Allowance | Nominal line voltage of 240 volts may be exceeded by 25% for 60 Hz operation |
| Primary Insulation Test | 4.0 KV rms |
Identifiers
| UPC | 623980952772 |
| 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 VT55A used on?▾
The VT55A has a 240V nominal line voltage and a 240:120 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 240V version.
What is the accuracy and burden rating of the VT55A?▾
Accuracy is 1.2%, the VA range is 0-8 and the thermal rating is 50.
Can the VT55A run above 240V?▾
The series data states that the nominal line voltages of 240 and 480 volts may be exceeded by 25% for 60 Hz operation, which applies to this 240V model.
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 VT55A 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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