Commercial Door Operators Models MH MH Type: Jackshaft Medium duty: less 12 cycles / hour Power: ½ HP With chain hoist Single‑Phase: 115V More details MT MT Type: Trolley Medium duty: less 12 cycles / hour Power: ½ HP Emergency manual operation using accessible disconnect Single‑Phase: 115V More details RBH RBH Type: Jackshaft Industrial duty: more than 12 cycles/hour, max 80/day Heavy‑duty roller bearings Power: available in ½, ¾, and 1 HP With chain hoist Place mounted: On wall Factory installed brake Single-Phase: 115/230V, 3-Phase: 208/230/460V or 575V More details