Item # ASM66AA-N25, Closed Loop Step Motor

2.36 in. sq frame size sets the mounting envelope by the specified square frame, while Gear Ratio 25 :1 means the output is configured through a geared stage rather than direct shaft output. Resolution 0.0144 °/Pulse indicates fine commanded angular step at the specified output configuration, useful where positioning granularity matters; the trade-off is that any brake-holding function is absent, because Electromagnetic Brake is listed as Not Equipped.

100 MΩ minimum insulation resistance is specified when measured by a 500 VDC megger between frame-windings, and dielectric strength is stated for Frame-Windings at 1.5 kV 50 or 60 Hz for one minute. Insulation Class is Class B (266ºF [130ºC]), with UL/CSA recognition as Class A 221ºF (105ºC), so thermal assessment should be tied to the applicable standard marking rather than assuming a single universal insulation limit.

85% or less ambient humidity is allowed only with noncondensing conditions, and the operating atmosphere explicitly excludes corrosive gases, dust, water or oil. Safety standards are listed as UL CSA EN CE, with CE Marking for Low Voltage Directives EMC Directives; RoHS Compliant is No, so use in assemblies requiring RoHS conformity needs separate verification at the product-integration level.