Why does the 4 kW FSB need a fan when the 3 kW FSB does not?

At 4 kW (10.2 A continuous, 20.4 A overload), power stage losses exceed what natural convection can dissipate through the FSB heatsink alone. An integrated fan provides forced-air cooling through the heatsink fins, adding 35 mm to the enclosure depth (169 mm vs 134 mm for fanless FSB). Weight increases modestly to 7.52 kg (from 7.12 kg). The fan is field-replaceable as a service part. 24 V DC control supply consumption rises to approximately 550 mA for the AS-Interface variant — roughly double the fanless FSB current draw. This additional 24 V load must be accounted for in control panel power budgeting.

XH24 vs XM04 — same hardware, different catalog designation

XH24 and XM04 refer to the same physical hardware: both are 4 kW FSB fan-cooled drives. XH24 is the current catalog designation; XM04 is the earlier product generation code — identical situation to XH23/XM03 at 3 kW and XH60/XN00 in FSA.

AS-Interface (AF0) variant

Integrated AS-i slave for control and monitoring over the yellow AS-i flat cable — power and communication on a single two-conductor unshielded cable. No Ethernet switch or RJ45 infrastructure needed at the drive. 24 V DC control supply: approximately 550 mA (higher due to integrated fan).

Wall-mounted SINAMICS G115D distributed drive for horizontal conveyor applications. IP65/IP66 — mount directly on the machine frame, no cabinet. 3AC 380–480 V ±10%, 0–550 Hz, integrated EMC Cat C2 filter. STO SIL 2 / PL d via F-DI or PROFIsafe. SIMOGEAR 2KJ8 motor compatible (IE3/IE4). 200%/3 s, 150%/57 s overload. Ambient –30°C to +40°C. FSB fan-cooled, 425 × 180 × 169 mm, 7.52 kg.