Allen-Bradley 199-MSMD1 SER.A Surge Diode Supressor

Allen‑Bradley 199‑MSMD1 is a surge suppression diode module designed for use with relay coils, providing protection against voltage spikes generated during switching, improving reliability and extending the life of control components. Manufacturer: Allen‑Bradley (Rockwell Automation) Country of Manufacture: USA Product Type: Surge Suppressor / Diode Module Catalog Number: 199‑MSMD1 Series: A Compatible Relay Series: 700‑M relay series Suppression Type: Diode (flyback diode) Rated Voltage Range: 12–250 VDC Function: Suppresses inductive voltage spikes from relay coils Connection Type: Pre‑wired leads for quick installation Polarity: Polarity sensitive (marked on housing) Mounting Type: Plug‑in / snap‑on module for relay base or socket Protection Type: Transient voltage suppression for DC circuits Housing Material: Insulated thermoplastic enclosure Color: White housing with printed diagram and markings Indicator: No visual indicator (passive protection device) Wiring Diagram: Printed on housing for correct installation Application Type: Control circuit protection Typical Use: PLC panels, relay control circuits, automation systems Compatibility: Designed specifically for Allen‑Bradley 700‑M control relays Operating Environment: Industrial electrical panels and enclosures Function Detail: Absorbs back EMF generated when relay coil is de‑energized Construction: Compact encapsulated diode module with integrated wiring leads Standards Compliance: UL Recognized, CE marked (typical for Allen‑Bradley accessories) Approximate Dimensions: 40–60 mm length, 20–40 mm width, 15–25 mm height Approximate Weight: 0.05–0.15 kg