Digital RCD (ELCB) Tester UNI-T UT582+ , AUTO RAMP, CAT III 600 V

UNI-T UT582+ Digital RCD (ELCB) Tester, AUTO RAMP, CAT III 600 V

The UNI-T UT582+ is a digital RCD (ELCB) tester designed to verify whether a residual-current protective device trips correctly and to measure its trip time and, in AUTO RAMP mode, its trip current. It is intended for single-phase 230 V electrical circuits and provides selectable nominal RCD currents of 10, 20, 30, 100, 300 and 500 mA. The instrument can also measure 30–600 V AC voltage and display frequency from 45 to 65 Hz.

Key parameters: RCD 10/20/30/100/300/500 mA • ×1/2, ×1, ×5 and AUTO RAMP • 0° / 180° phase • 30–600 V AC • CAT III 600 V

Main features and benefits

• Four RCD test modes – ×1/2, ×1, ×5 and AUTO RAMP – allow verification that the RCD does not trip at half rated current and trips correctly at rated or increased test current.
• AUTO RAMP function – automatically increases test current from 20% to 110% of the selected IΔn in 10% steps to determine the RCD trip current and trip time.
• Selectable nominal RCD current – 10, 20, 30, 100, 300 or 500 mA depending on the selected test mode.
• 0° and 180° phase-angle selection – allows the test to start on either the positive or negative half-cycle for comparison of trip times.
• 25 V / 50 V contact-voltage limit – if the selected contact-voltage limit is exceeded, the tester displays a warning and stops the RCD test.
• Wiring check – L-PE, L-N and N-PE indications on the LCD help identify incorrect line, neutral or protective-earth connections before testing.
• 30–600 V AC voltage measurement – enables checking of L-N or L-PE mains voltage.
• 45–65 Hz frequency indication – frequency can be displayed in VOLTS mode; the manufacturer specifies the frequency indication as reference information only.
• LCD backlight and Data Hold – improve readability and allow the measurement result to remain on the display.
• Auto power-off and audible warnings – the instrument switches off automatically after approximately 5 minutes of inactivity and provides operating/disconnection warning indications.

Applications and intended use

The UT582+ is intended for testing RCD protective devices in single-phase 230 V electrical circuits. It can measure RCD trip time at different test-current multiples, determine trip current using AUTO RAMP, check circuit wiring status and measure mains voltage and frequency.

It is suitable for electrical installation, inspection and maintenance work. The manufacturer's manual specifies that the instrument is to be operated by trained and qualified personnel.

Compatibility and limitations

• The RCD test function is intended for single-phase 230 V / 50 Hz circuits with an actual supply voltage of 195–253 V.
• Available nominal IΔn settings are 10, 20, 30, 100, 300 and 500 mA, depending on the selected mode.
• ×5 testing is available only for 10, 20 and 30 mA RCD settings.
• The 500 mA ×1 test has a maximum test time of 300 ms rather than 1000 ms.
• The reviewed official UNI-T documentation does not specify compatibility by RCD waveform type such as AC, A, F or B. Where type-specific compliance testing is required, the requirements of the particular RCD and applicable standard should be checked before selecting the instrument.
• The instrument is not intended for long-term continuous RCD testing on production lines; the manufacturer specifies it for sampling/precision testing.
• High-current 300 mA and 500 mA tests may only be carried out once every 5 minutes.

Technical specifications

Parameter	Value
Model	UNI-T UT582+
Instrument type	Digital RCD (ELCB) tester
RCD test supply	230 V AC, 50 Hz
Permitted RCD test supply range	195–253 V AC
Nominal RCD currents IΔn	10 / 20 / 30 / 100 / 300 / 500 mA
×1/2 mode	10 / 20 / 30 / 100 / 300 / 500 mA
×1/2 maximum test time	2000 ms
×1/2 test-current tolerance	−10%…0%
×1 mode	10 / 20 / 30 / 100 / 300 mA
×1 maximum test time	1000 ms
×1 test-current tolerance	0%…+10%
×1, 500 mA	Max. 300 ms; test-current tolerance 0%…+10%
×5 mode	10 / 20 / 30 mA
×5 maximum test time	40 ms
×5 test-current tolerance	0%…+10%
AUTO RAMP nominal currents	10 / 20 / 30 / 100 / 300 / 500 mA
AUTO RAMP sequence	20–110% of IΔn in 10% steps
AUTO RAMP maximum test time	300 ms
AUTO RAMP test-current tolerance	−10%…+10%
Trip-time accuracy	±(2% of reading + 2 digits)
Test phase angle	0° / 180°
Contact-voltage limits	UL 25 V / UL 50 V
AC voltage measurement range	30–600 V
Voltage resolution	1 V
Voltage accuracy	±(3% of reading + 3 digits)
Frequency indication range	45–65 Hz
Frequency indication resolution	1 Hz
Frequency accuracy	Not specified; the manual states that frequency indication is for reference only
Display count	1000
Wiring check	L-PE, L-N and N-PE status indication on LCD
Data Hold	Yes
LCD backlight	Yes
Over-range indication	OL
Auto power-off	Approx. 5 minutes of inactivity
Low-battery indication	Approx. <7.2 V
Power supply	6 × 1.5 V AA / LR6 alkaline batteries
Safety category	CAT III 600 V
Pollution degree	2
Insulation	Double or reinforced insulation
Compliance standards	IEC 61010-1; IEC 61010-2-030; IEC 61010-2-033; IEC 61557-1; IEC 61557-6; EN 61326-1; EN 61326-2-2
Certification markings	CE, UKCA
Operating temperature	0–40 °C
Operating relative humidity	≤80% RH
Maximum operating altitude	≤2000 m
Storage temperature	−20–60 °C
Storage relative humidity	≤75% RH
Specified accuracy conditions	23 ±5 °C, 45–75% RH, altitude ≤2000 m
Display size	71 × 34 mm
Product dimensions	160 × 70.5 × 100 mm
Net weight	Approx. 400 g

Construction and controls

The UT582+ has an LCD display, rotary function selector and dedicated controls for nominal RCD current, phase/contact-voltage limit and TEST operation. In VOLTS mode, the keys can be used to select L-N or L-PE voltage indication, switch between voltage and frequency display and activate the LCD backlight.

Separate L, E and N test terminals are provided. A three-terminal lead is used for RCD testing, while separate CAT III 600 V test leads may be used for voltage measurements.

Important operating and safety notes

• Verify correct L, N and PE wiring before carrying out an RCD test.
• If the wiring indication shows an incorrect connection, do not operate the TEST function until the wiring fault has been corrected.
• Do not touch exposed metal parts or test conductors during measurement.
• For voltage measurements, the manufacturer specifies test leads meeting CAT III 600 V and IEC 61010-031 requirements.
• Disconnect the test leads from the circuit immediately after completing an RCD test.
• Internal components can become hot during repeated testing.
• High-current 300 mA and 500 mA tests may only be performed once every 5 minutes.

Package contents

• Three-terminal RCD test lead, approx. 1.5 m
• Test lead set
• Carrying bag
• Elastic carrying / retaining strap