The Festo ERMS-32-90-ST-M-H1-PLK-AA is a rotary drive unit — a motor unit accessory — designed to mount onto Festo's EGSL, EGSC, and EGSS mini linear actuators. It delivers a 90° rotation at 24 VDC, with a 105 mm body length that matches the actuator's mounting interface. If you're building or servicing a pick-and-place cell or compact handling station that uses those actuator series, this is the bolt-on rotary module that adds a 90-degree turn at the end of the stroke.
The 90° rotation is the key fit parameter — it's a fixed-angle unit, not adjustable, so the application must need exactly a quarter-turn. The 24 VDC supply is standard for modern control cabinets, but verify your actuator's own supply voltage matches; the ERMS draws from the same 24 V bus as the actuator's drive electronics. The 105 mm length sets the overall envelope when mounted — check that the combined actuator-plus-ERMS assembly clears any adjacent tooling or guarding. As a Motor Unit accessory type, this is the powered rotary head, not a passive coupling or bracket. It includes the motor and gearing to produce the 90° swing; the actuator itself provides the linear motion. The two together form a compact rotary-linear module without a separate rotary stage.
The closest peer is the ERMS-25-90-ST-M-H1-PLK-AA, which shares the same 90° rotation, 24 VDC supply, and compatibility with EGSL/EGSC/EGSS actuators. The difference is the frame size: the -32 variant is physically larger (105 mm vs the -25's shorter body) and mates to the 32 mm-wide actuator platform. If your actuator is the EGSL-25 or EGSC-25, the -25 ERMS is the correct match; the -32 won't align to the mounting holes. No rewiring difference — both use the same electrical interface.