UL 2557:2020 PDF Download

UL 2557:2020 standard specifies requirements for membrane switches that are operated or controlled by human activity. These membrane switches utilize a membrane or sensing substrate to actuate and control appliances and electrical equipment. The standard applies to membrane switches with electrical ratings not exceeding 30 Vrms and power not greater than 100 VA.

The standard clarifies that when it references "switches," it specifically refers to "membrane switches" unless otherwise indicated. It also includes membrane switches that incorporate additional control functions, which are governed by the switch's function. These additional control functions need to be evaluated for their suitability using the relevant application standards.

The membrane switches covered by this standard are intended to be operated by a person via a membrane or by actuating a sensing substrate. It also covers situations where the switch's actuating member or sensing unit is provided by a remote control or a part of an appliance or equipment, such as a door.

Furthermore, the standard addresses the evaluation of embedded components in membrane switch constructions. These components are evaluated for their safety and application to the membrane switch. The acceptability of an embedded component in the membrane switch is considered based on the construction and performance requirements in the final application of the end product.