The VW3A3E407 is an encoder interface card for the Schneider Altivar drive family, providing a push-pull discrete output at 24 V DC. It accepts A/B/Complement of A/Complement of B quadrature inputs at up to 300 kHz, with a 1000-ohm input impedance. This card is now listed as obsolete by the manufacturer.
The card connects via a terminal block accepting 0.2 mm² wire, with a maximum cable run of 500 m between encoder and drive. Supply current draw is 0.175 A at the 24 V DC nominal rail (20...30 V limits). The push-pull output handles 100 mA at 14 V. Built-in overload and short-circuit protection covers the output stage.
The 300 kHz maximum operating frequency and 10000/5000 pulses-per-revolution range suit it for moderate-speed encoder feedback on conveyor or fan drives. The 0 V guaranteed state sits between 11.5 V and under 25 V, which is the standard threshold for 24 V logic families.