The 12147A is a professional toggle switch from APEM's 12000 series, designed for high-specification environments requiring robust switching performance. It features a double-pole configuration with momentary-off-momentary (MOM-OFF-MOM) function and a 20° angle of throw, equipped with solder lug terminals for reliable electrical connections. The switch incorporates a threaded bushing with Ø 11.9 mm (15/32-32UNS) for secure panel mounting and is available with multiple contact material options including silver (A), silver gold-plated (AD2), or solid gold (D) contacts. Electrical specifications include maximum current ratings of 4 A at 30 VDC for silver contacts and 100 mA at 30 VDC for gold contacts, with initial contact resistance of 10 mO maximum and insulation resistance of 1,000 MO minimum at 500 VDC. The switch is CECC approved and conforms to ML specifications, making it suitable for demanding applications in aerospace, military, industrial control, and professional instrumentation where reliable toggle switching with momentary action is required.