Megger RCDT320 RCD Tester
The Megger RCDT320 RCD Tester is a mid-range instrument in the RCDT300 series. It tests a wide range of residual current devices, including general, selective and DC breaker types. Supported ratings include 30 mA, 100 mA, 300 mA and 500 mA, together with 10 mA and 1 A RCDs.
For routine inspection work, the tester performs 1/2 I, 1 I and 5 I trip time tests where applicable. A ramp test raises the current in controlled steps until the RCD trips, helping the user identify its trip current. The automatic sequence mode guides the user through the required test cycle while storing each result on the instrument for reference during the sequence.
Practical features help make testing clear and controlled. Users can select 0° or 180° polarity and view touch voltage at the start of a test, with a selectable 25 V or 50 V inhibit level. A large backlit display, colour-coded ranges, rubber-armoured casing and rigid folding cover support use in demanding working environments.
Key Benefits
- Tests general, selective and DC RCD types with one instrument.
- Supports RCD ratings from 10 mA through to 1 A.
- Ramp testing gradually increases current until the RCD operates.
- Automatic sequences reduce the amount of input needed during repeated tests.
- Stored sequence results remain available on the meter for reference.
- Selectable 0° and 180° polarity supports testing on both waveform positions.
- Touch voltage measurement provides information at the start of the test.
- A backlit, colour-coded display helps users select and read test functions.
- Rubber armour and a rigid display cover protect the instrument during site use.
- Battery, fuse and automatic power-down functions support routine operation and maintenance.
Common Applications
Megger RCDT320 RCD Tester is suitable for a range of testing, maintenance and inspection tasks, including:
- Trip time testing at 1/2 I, 1 I and 5 I.
- Testing general residual current devices.
- Testing selective or time-delayed RCDs.
- Testing DC breakers at 1/2 I, 1 I and 5 I.
- Testing 30 mA, 100 mA, 300 mA and 500 mA RCDs.
- Testing RCDs rated at 10 mA and 1 A.
- RCD trip current testing using the ramp function.
- Automatic sequence testing during electrical inspections.
- Touch voltage measurement before an RCD test proceeds.
- Polarity-selectable testing at 0° or 180°.
Why Choose This Model?
The RCDT320 adds 10 mA and 1 A RCD testing, ramp testing, automatic sequences, frequency measurement and a backlight compared with the RCDT310. It suits users who need these added test functions without the programmable RCD, result storage, download and USB features of the RCDT330.