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The Multi IO Extension 590 serves as a power-saving alternative to commercial standard coupling relays. The coupling relay is controlled as a mono-stable relay, but uses a bi-stable relay internally, thus reducing the holding current by up to 95%.

The Multi IO Extension 590 has an integrated fuse to protect high-quality equipment.
| Mechanical data | |
| Housing | plastic |
| DIN rail mounted device, width | 1 modules (18 mm) |
| Weigth | approx 50 g |
| Indicator & Fuse | |
| LED | (green) show relay state |
| Glass fuse | 5x20mm, 10 A |
| Connectors | |
| Screw terminal (2 poles) | for 24 V⎓ input |
| Screw terminal (3 poles) | for 230 V∿ output |
| Input | |
| Input voltage (signal) | 24 V⎓ |
| “Holding current” | < 2 mA |
| Input | |
| Fuse | 10 A |
| Relay type | 250 V∿ / 16 A, bi-stable |
| Depending on load type (capacitive or inductive) the switching power can be reduced significantly. | |