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.
⚠️ WARNING (California Proposition 65): This product may contain chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, please visit www.P65Warnings.ca.gov.
