Description
Overview
The UT513A is the straightforward 5 kV insulation tester for routine maintenance and commissioning. It outputs test voltages up to 5 kV, reads insulation resistance up to 1 TΩ at ±(3%+5) accuracy, and is rated CAT III 600 V — the core capability for checking motor windings, cables, and switchgear without the extras you don't always need.
It still runs a Polarization Index test for moisture and aging, displays leakage current, and discharges the circuit automatically when a test ends. A comparison function gives a quick pass/fail call, and results store on-board for transfer over USB. It's backed by UNI-T's nearly 40 years of test-meter manufacturing.
Key Features
- Test voltage output up to 5 kV
- Insulation resistance up to 1 TΩ, accuracy ±(3%+5)
- Polarization Index (PI) timed test
- Automatic discharge after test
- Comparison function for pass/fail
- Auto-ranging measurement
- 18-set data storage with USB transfer
- CAT III 600 V safety rating
UT513A Details
5 kV Insulation Testing
The UT513A delivers test voltage up to 5 kV and reads insulation resistance up to 1 TΩ, covering the routine high-voltage checks in motor, cable, and switchgear maintenance with auto-ranging that keeps readings on-scale without manual range selection.
Polarization Index
A timed PI measurement flags moisture and aging in windings that a quick spot reading would pass, so early insulation degradation shows up before it becomes a failure.
Discharge & Comparison
The circuit discharges automatically at the end of each test, and a comparison function sets a pass/fail threshold for fast, consistent go/no-go decisions across multiple test points.
Field Build
A compact handheld rated CAT III 600 V, the UT513A stores 18 result sets and transfers them to a PC over USB for basic record-keeping.
Compare the UT513 Series
| UT512E | UT513A | UT513B | UT513C | |
|---|---|---|---|---|
| Max test voltage | 2500 V | 5 kV | 5 kV | 5 kV |
| Max insulation resistance | 2.5 TΩ | 1 TΩ | 2 TΩ | 5 TΩ |
| Voltage stepping (10% of range) | Yes | — | Yes | Yes |
| PI / DAR diagnostics | PI | PI | PI / DAR | PI / DAR |
| Capacitance measurement | 2 µF | — | — | 0.01–15 µF |
| Data storage | 999 sets | 18 sets | 999 sets | 999 sets |
| Bluetooth app | — | — | — | Yes |
| Safety rating | CAT IV 600 V | CAT III 600 V | CAT IV 600 V | CAT IV 600 V |
Applications
Routine insulation checks on motor and generator windings; cable and feeder testing; switchgear and panel maintenance; and commissioning checks before equipment is energized.
Frequently Asked Questions
What is the maximum test voltage and resistance range?
The UT513A outputs up to 5 kV and reads insulation resistance up to 1 TΩ.
Does the UT513A measure Polarization Index?
Yes — it runs a timed PI test to reveal moisture and aging in insulation.
Should I choose the UT513A or the UT513B?
The UT513A is the basic 1 TΩ / CAT III model for routine testing; step up to the UT513B for a 2 TΩ range, CAT IV 600 V, stepped-voltage profiling, DAR, and 999-set storage.
Specifications
| DC Voltage In | 600 V |
| AC Voltage In | 600 V |
| Max Resistance | 1 TΩ |
| Resistance Accuracy | ±(3% + 5) |
| Max IR Test Voltage | 5000 V |
| Insulation Resistance | Yes |
| Test Voltage Accuracy | 0% – 20% |
| Short Circuit Current | > 3.5 mA |
| Charge Current | 3.5 mA |
| Auto Ranging | Yes |
| Comparison Function | Yes |
| Polarization Index | Yes |
| Auto Discharge | Yes |
| Interface | USB |
| Data Storage | 18 |
| CAT Rating | CAT III 600 V |
| Weight | 2 kg |
| Dimensions | 202 × 155 × 94 mm |
Documentation
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