DatasheetDelta 72-S
Residual current device, 72 × 72 mm
| Type | Residual current device for monitoring fault and leakage currents |
|---|---|
| Model | Delta 72-S |
| Format | 72 × 72 mm |
| Input | Low-voltage line with TD series transformer |
| Waveform | Sinusoidal, AC type; chopped pulsating with superimposed DC component, A type |
| Rated frequency | 50 Hz |
| Working frequency | 47…63 Hz |
| Residual current setting | Selectable by 7-position potentiometer, 3 ranges ×1 / ×10 / ×100 |
| IΔn ranges | 30 mA…30 A |
| Non-operating residual current | 0.5 × IΔn |
| Intervention time | Selectable by 7-position potentiometer |
| Intervention time ranges | 0 / 0.15 / 0.25 / 0.5 / 1 / 2.5 / 5 s |
| Instantaneous trip | t = 0 s at IΔn 30 mA |
| Pre-alarm | 50 % IΔn, relay switching |
| Power-on signalling | Green LED “ON” |
| Instantaneous value display | LED bar graph with 4 yellow LEDs, 20 / 30 / 40 / 50 % of the set IΔn value |
| Alarm intervention | Red LED “TRIP” and relay switching |
| Ring current transformer fault | Red LED “TRIP” blinking and relay switching |
| Test | Local or automatic |
| Remote test | By external contact, not available with DC supply and Uaux 48 VAC |
| Automatic continuous test | Verifies the integrity of the connection between relay and ring core |
| Alarm memorization | Red LED “TRIP” and relay self-retaining, except with automatic reset |
| Reset | Manual or automatic, selectable by DIP switch |
| Automatic reset | 3 restart attempts, each 60 seconds |
| Reset inhibit | With persistent residual current > 50 % IΔn |
| Output | Alarm relay with SPDT contact |
| Contact rating | 5 A / 250 VAC at cosφ 1; 3 A / 250 VAC at cosφ 0.4; 5 A / 30 VDC |
| Security | Negative or positive safety, selectable by DIP switch |
| AC auxiliary supply | 24 / 48 / 115 / 230 / 240 / 400 VAC |
| DC auxiliary supply | 20…150 VDC |
| Installation category | III |
| Pollution degree | 2 |
| Insulation reference voltage | 450 V |
| Impulse withstand voltage | 5 kV, 1.2/50 µs, 0.5 J |
| Operating temperature | -5…50 °C |
| Storage temperature | -40…70 °C |
| Protection degree | IP40 front, IP20 terminals |
| Depth | 75 mm |
| Weight | 250 g |
