Hammond HX74A 480V Instrument Potential Transformer, 0-20 VA
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Create Free Business AccountKey Features
- 480V nominal line voltage, 480:120 ratio for 150 Volt full scale A.C. voltmeters
- 1.2% accuracy, 0-20 VA burden, thermal rating 100
- Primary insulated for 4.0 KV rms test for L.V. switchgear and motor control use
- 50/60 Hz operation
- Nominal 480V may be exceeded by 25% for 60 Hz operation
- Open construction - "Type H"; Class 105 insulation, 55 degree C rise
- Mounting centers 3.13 in (80 mm) x 3.13 in (80 mm); 0.22 in x 0.44 in mounting slot
- CSA certified (209651); RoHS and REACH compliant
The HX74A is the larger-burden 480V instrument potential transformer in the EX-HX-VT Series, stepping a 480 VAC line down at a 480:120 ratio so a 150 Volt full scale A.C. voltmeter can read the system voltage. It is aimed at panel builders and electricians fitting metering into low-voltage switchgear and motor control equipment on 480 VAC systems.
Electrically, the HX74A is rated for 50/60 Hz operation with 480:120 primary-to-secondary ratio, 1.2% accuracy, a 0-20 VA burden range and a thermal rating of 100. 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 480 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 3.75 in (95 mm), B 4.00 in (102 mm) and C 3.13 in (80 mm), with mounting centers D and E both 3.13 in (80 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 6.6 lb; the part page lists 6.65 lbs (3.02 kg). For the same 480:120 ratio in a smaller 0-8 VA package, see the VT57A.
The HX74A 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 480 VAC systems
- Panel instrumentation on 50/60 Hz systems
Overview
| Series | EX-HX-VT Series - Potential Transformer Instrument |
| Description | Potential transformer, instrument, 480V, ratio 480:120, HX series |
| Part Number | HX74A |
| Short Description | VOLTAGE TRANSFORMER 100VA 480 |
Dimensions
| Mounting Slot G | 0.22 in (6 mm) |
| Mounting Slot H | 0.44 in (11 mm) |
| Mounting Centers D | 3.13 in (80 mm) |
| Mounting Centers E | 3.13 in (80 mm) |
| Overall Dimension A | 3.75 in (95 mm) |
| Overall Dimension B | 4.00 in (102 mm) |
| Overall Dimension C | 3.13 in (80 mm) |
Electrical
| VA | 0-20 |
| Frequency | 50/60 Hz |
| Accuracy % | 1.2 |
| Intended Meter | 150 Volt full scale A.C. voltmeter |
| Thermal Rating | 100 |
| Ratio Pri./Sec. | 480:120 |
| Nominal Line Voltage | 480 |
| Overvoltage Allowance | Nominal line voltage of 480 volts may be exceeded by 25% for 60 Hz operation |
| Primary Insulation Test | 4.0 KV rms |
Identifiers
| UPC | 623980952819 |
| UNSPSC | 39121301 |
Packaging & Shipping
| Shipping Weight | 6.65 lbs (3.02 kg) |
| Ship Weight (Spec Sheet) | 6.6 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 HX74A used on?▾
The HX74A has a 480V nominal line voltage and a 480:120 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 480V version.
What is the accuracy and burden rating of the HX74A?▾
Accuracy is 1.2%, the VA range is 0-20 and the thermal rating is 100.
Can the HX74A run above 480V?▾
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 480V 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 HX74A mounted?▾
It is an open "Type H" construction with mounting centers of 3.13 in (80 mm) (D) and 3.13 in (80 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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