KYORITSU KEW 5406A Digital RCD Tester
The Kyoritsu KEW 5406A is a mains‑powered digital RCD (Residual Current Device) tester designed for rapid verification of protective devices in single‑phase 230 V AC or OLD‑TT systems. Instead of batteries, it draws test current directly from the circuit under test, ensuring uninterrupted operation. Five selectable test modes (×½, ×1, ×5, DC and Auto Ramp) allow checking that RCDs trip neither too readily nor too sluggishly, and to determine both trip current (IΔn) and trip time (tΔ) under standardized conditions.
A three‑LED wiring check confirms correct phase‑neutral‑earth connections before testing, enhancing operator safety. The integral phase‑angle selector (0°/180°) captures minimum and maximum trip times, while UL‑value selection (25 V/50 V) suspends testing if touch voltage exceeds safe limits. Over‑temperature detection halts tests and displays a warning if internal components overheat. Upon completion of each test, the display holds the result for three seconds before auto‑reset, and the instrument’s rugged housing with finger‑guards provides CAT III 300 V protection.
Compact dimensions (186 × 167 × 89 mm) and a lightweight build (800 g) make it suitable for field technicians and electricians conducting periodic safety verifications on RCDs in residential, commercial, or industrial installations.
Features:
- Mains‑powered operation—no batteries required.
- Five test modes: ×½ (no‑trip), ×1 (trip), ×5 (fast‑trip), DC sensitivity, Auto Ramp.
- Three‑LED wiring check for P‑E/P‑N polarity verification.
- Phase‑angle selector (0°/180°) for min/max trip‑time measurement.
- UL‑value select (25 V/50 V) to prevent unsafe touch‑voltage tests.
- Over‑temperature detection halting further tests on thermal overload.
- Auto data‑hold freezing result post‑test for 3 s.
Specifications:
| Specification | Details |
|---|---|
| Test functions: | ×½, ×1, ×5, DC test, Auto Ramp (20 %–110 % IΔn; max. 300 ms × 10) |
| Rated voltage: | 230 V AC +10 %/–15 %, 50 Hz |
| Trip‑current settings (IΔn): | 10 mA, 20 mA, 30 mA, 200 mA, 300 mA, 500 mA (+6 mA DC) |
| Trip‑time accuracy: | ×½: –8 % – –2 %; ×1: +2 % – +8 %; ×5: –10 % – +10 %; Auto Ramp: –8 % – +8 % |
| Display: | 3½‑digit LCD with ms/mA units; “1” indicates overrange; wiring‑check LEDs |
| Safety standards: | IEC 61010‑1 CAT III 300 V; test‑lead IEC 61010‑031 CAT III 600 V; EMC IEC 61326‑1; RoHS EN50581 |
| Operating temp./humidity: | 0 – 40 °C, ≤ 80 % RH (no condensation) |
| Storage temp./humidity: | –20 – 60 °C, ≤ 75 % RH (no condensation) |
| Dimensions & weight: | 186 × 167 × 89 mm; 800 g |
Applications:
- Verification of RCD Trip Time.
- Determination of RCD Sensitivity (Trip Current).
- Safety Wiring Check for Phase‑Neutral‑Earth Connections.
- Selective Testing on OLD‑TT Earthing Systems.
- Automated Ramp‑Rate Sensitivity Analysis.
Package Contents:
- 1x Main unit (Model KEW 5406A)
- 1x Mains lead with protective finger‑guards
- 1x Test lead (Model 7125)
- 1x Instruction manual
- 1x Strap belt assembly
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