- Ideal for domestic and industrial testing
- Selectable 250 V and 500 V insulation tests
- Automatic continuity testing above 200 mA
- Live circuit warning with test inhibition
Megger MIT220 Insulation and Continuity Tester
Built for insulation and continuity work on domestic and industrial electrical systems, the Megger MIT220 Insulation and Continuity Tester provides selectable 250 V and 500 V d.c. insulation test voltages in a compact ABS instrument. Its combined digital readout and analogue arc supports precise readings while retaining a pointer response for evaluating circuit charge and discharge characteristics. A 10 kΩ to 1000 MΩ insulation measurement range covers low-voltage insulation applications, while the CAT III 600 V safety category supports work on electrical installations.
For continuity checks, automatic testing applies more than 200 mA in the 0 to 10 Ω range and measures from 0.01 Ω to 100 Ω, allowing both hands to remain on the probes. Lead null compensates for up to 9.99 Ω of test-lead resistance, while the buzzer supports rapid circuit identification below 2 Ω. Live-voltage display activates from 25 V, testing is inhibited above 50 V, and automatic discharge after insulation testing lets the user monitor any remaining voltage on the display.
Key Benefits
- Selectable 250 V and 500 V test voltages support different insulation testing requirements
- Automatic continuity testing starts without pressing the test button, leaving both hands available for the probes
- Combined digital and analogue arc display presents precise values and responsive circuit behaviour
- Lead-null storage compensates for test-lead resistance until the stored value is reset
- Live-circuit detection warns when an a.c. or d.c. voltage greater than 25 V is present
- Test inhibit prevents insulation and continuity testing when more than 50 V is detected
- Automatic discharge removes test voltage after insulation tests and shows the discharge on the display
- Automatic power-down after 10 minutes in standby helps preserve battery power
Common Applications
The Megger MIT220 is suitable for a range of electrical installation, testing and maintenance tasks, including:
- Installing domestic electrical systems
- Installing industrial electrical systems
- Site maintenance and service work
- Testing fixed electrical wiring systems
- Testing domestic appliances
- Testing power tools
- Testing transformers
- Testing motors and generators
- Testing switchgear
- Testing electrical panels
General Specifications
| Specification | Details |
|---|---|
| Product type | Digital and analogue insulation and continuity tester |
| Insulation test voltages | 250 V d.c. and 500 V d.c. |
| Display | Digital readout with analogue arc display |
| Backlight | Operates for 1 minute and can be reinitialised by changing range or pressing TEST |
| Live-voltage display | Automatically displays a.c. or d.c. voltage from 25 V to 600 V |
| Test inhibit | Testing is inhibited when more than 50 V is detected |
| Automatic discharge | Automatically discharges the circuit after insulation testing and displays any voltage present |
| Automatic power-down | Operates after 10 minutes in standby mode |
| Safety category | CAT III 600 V phase to earth |
| Safety standards | Meets IEC 61010-1 and conforms to EN 61557 |
| EMC | In accordance with IEC 61326-1 |
| Power supply | 6 x 1.5 V IEC LR6 AA alkaline cells or NiMH rechargeable cells |
| Battery indication | Four-section battery condition bargraph |
| Battery life | 3000 consecutive tests using 2 Ah batteries |
| Fuse | 500 mA (F) 600 V, 32 x 6 mm ceramic HBC, 50 kA minimum, with ruptured-fuse indication |
Measurement and Accuracy Specifications
| Measurement Function | Range and Details | Accuracy |
|---|---|---|
| Insulation resistance | 250 V d.c. and 500 V d.c. test voltages 10 kΩ to 1000 MΩ on both ranges Test current greater than 1 mA at the minimum pass values |
At 20 °C: ±3 % of reading ±2 digits up to 10 MΩ ±5 % of reading ±2 digits up to 100 MΩ ±30 % of reading up to 1000 MΩ |
| Insulation test output | Terminal voltage on open circuit | −0 % to +25 % of rated voltage |
| Continuity resistance | 0.01 Ω to 100 Ω 0 to 50 Ω on the analogue scale Lead null from 0 to 9.99 Ω Buzzer operates below 2 Ω with a response time below 20 ms |
At 20 °C: ±3 % ±2 digits from 0 to 10 Ω ±5 % ±2 digits from 10 to 100 Ω |
| Continuity test output | Open-circuit voltage: 5 V ±1 V Short-circuit current: 205 mA +10 mA −5 mA from 0 to 10 Ω Greater than 18 mA from 10 to 100 Ω |
Specified output values |
| Default voltmeter | 25 V to 600 V at 50/60 Hz and d.c. | 25 V to 450 V a.c./d.c.: ±1 % ±1 digit 450 V to 600 V a.c.: ±2 % ±1 digit |
Mechanical and General Information
| Specification | Details |
|---|---|
| Housing | Tough ABS housing |
| Dimensions | 195 x 98 x 40 mm |
| Operating temperature | -10 °C to +55 °C |
| Operating humidity | 93 % R.H. at +40 °C maximum |
| Storage temperature | -25 °C to +65 °C |
| Ingress protection | IP40 |
Specification Notes
- Measurement accuracy figures are specified at 20 °C
- The stated battery life uses 2 Ah batteries and consecutive five-second tests
- Circuits must be switched off, de-energised and isolated before insulation or continuity test connections are made
Meta Description
Megger MIT220 Insulation and Continuity Tester offers 250 V and 500 V testing, automatic continuity and live-circuit warning.