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The Eelectron IO42E01KNX is a flush-mount (in-wall) KNX multifunction module with 4 inputs, 2 bistable relay outputs and an integrated Bluetooth Low Energy beacon, configurable in ETS for KNX Data Secure. At 52 x 28 mm it fits behind a switch plate or in a ceiling box, which makes it the natural choice for retrofits and for hotel rooms where a few local loads and contacts must join the bus without running cable back to the panel.
Two inputs are digital, one is digital/analog and one is digital/analog/smart-sensor: NTC probes (TS01A01ACC, TS01B01ACC, TS01D01ACC) feed a complete 2-stage PI thermostat, and input 4 accepts the SM03E01ACC (CO₂ + temperature) or SM03E02ACC (VOC/eCO₂ + temperature) plug-in sensors for air quality. The two 10 A relays work independently, as a shutter pair, as a servomotor pair or with logic interlock. The iBeacon/Eddystone-compatible BLE beacon lets a guest app detect which room it is in, and the Virtual Holder logic derives reliable occupancy from a door contact plus presence sensors.
| Power supply | Via KNX bus, 21–32 V DC (SELV) |
| Current consumption | < 10 mA |
| Inputs (digital mode) | Dry contacts; scanning voltage 3.3 V DC (internally generated); max cable 10 m (33 ft) twisted; AWG26 leads 90 mm |
| Inputs (analog mode) | NTC TS01A01ACC (-20 to +100 °C), TS01B01ACC (-50 to +60 °C), TS01D01ACC (-5 to +45 °C); max cable 30 m (98 ft) twisted |
| Outputs | 2 relays, 10 A cos φ 1 at 230 V AC; resistive 10 A, incandescent 6 A, inductive (motor) 3 A; check LED driver inrush |
| Wireless | BLE beacon, iBeacon / Eddystone compatible |
| Logic blocks | 12 |
| Group addresses / associations | 264 / 308 |
| Mounting | Flush-mount wall or ceiling box |
| Enclosure | Nylon, IP20 (EN 60529); protection class III; overvoltage class III; pollution degree 2 |
| Dimensions | Ø 52 x 28 mm (2.05 x 1.10 in) |
| Operating temperature | -5 °C to +45 °C (23 °F to 113 °F) |
| Storage temperature | -20 °C to +55 °C (-4 °F to 131 °F) |
| Relative humidity | max 90 % non-condensing |
| Standards | EN 63044-5-1 / EN 63044-5-2; EN 50491-2; LVD 2014/35/EU; EMC 2014/30/EU |
| Certifications | KNX certified; CE |
| ETS application | IO42E01KNX application with KNX Data Secure |
| Weight (net) | 0.09 kg (0.20 lb) |
| Manufacturer part no. / GTIN | IO42E01KNX / 8054144522630 |
Input-only in-wall interfaces: IO22D02KNX, IO44D02KNX / IO44D02KNX-S (secure), IO62D02KNX; analog/LED in-wall module AD84C01KNX. Accessories: TS01A01ACC / TS01B01ACC / TS01D01ACC probes; SM03E01ACC / SM03E02ACC plug-in sensors. DIN-rail equivalent with more channels: IO04F01KNX.
CE certified; not UL/NRTL listed — verify local code requirements before specifying in US installations.
Datasheet (PDF) · Available to order.
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