GFCI / RCD Trip-Time Reference Tool

An RCD is judged on two numbers: how much leakage it lets through and how fast it lets go. Neither is "as small as possible" - a device that trips on every harmless ripple becomes a nuisance - so the ratings and times are a deliberate band.

GFCI / RCD Trip-Time Reference Tool lists standard ratings, their thresholds and maximum clearing times under IEC 60364 and UL 943, and gives a quick verdict on your measured leakage.

It is a reference aid. The exact device data comes from the manufacturer and the code in force.

• Standard ratings: 10, 30, 100, 300 mA and more.
• Threshold bands: No-trip, may-trip and must-trip zones.
• Trip times: IEC 60364 and UL 943 limits.
• Types: AC, A, B and S explained.
• Hazard check: Verdict from your leakage figure.
• Reference tables: Curated look-up data.
• Export: Copy or download as text, CSV or JSON.

1. Choose the RCD rating (10 to 300 mA).
2. Enter the measured or estimated leakage.
3. Pick the type for context.
4. Read the threshold band and trip-time expectations.
5. See the hazard verdict and next step.

Example 1 — 30 mA circuit. 15 mA measured: between 0.5x and 1x - may trip intermittently, worth finding the leakage source.

Example 2 — 150 mA. Exactly 5x a 30 mA unit: the device must clear within 40 ms.

Example 3 — 300 mA main. 120 mA background leakage: below 0.5x, tolerated, but leave headroom for growth.

• Instant lookup: Thresholds at a glance.
• Both standards: IEC and UL figures shown.
• Field verdict: Judge a measurement fast.
• Type clarity: AC/A/B/S side by side.
• Private: No uploads, no accounts, no logging.