Grade 2 Patio Surface Door Contact with 1 Reed and 4 Core Pre-Wired - White [SC525/WH/4C] The SC525/WH/4C Grade 2 Patio Surface Door Contact are suitable for use in Ungraded, Grade 1 and Grade 2 systems. These contacts are required to have a mechanical tamper and/or be potted/sealed. End of Line (EOL) resistors are an option but are not a requirement to meet Grade 2. A range of contacts in plastic and aluminium which can be surface mounted and which will suit most domestic and commercial installations. Features: Patio surface contact 38 x 15 x 8mm 4 Core pre-wired Operating Gap - 20mm EN50131-2-6 Grade 2 Environmental Class: II Specification: Connections: 1m 4Core Reed Switches: 1 Pull-in Gap: 20mm Material: Polystyrene Size mm: 65 x 13.5 x 13 Contact Form: SPST form A Voltage Range: 1-50v DC Switching Current: 500mA Contact Material: Rhodium Colours: White