{"product_id":"sarm55w-000-mechanical-relay-board-yokogawa","title":"SARM55W-000 Mechanical Relay Board Yokogawa","description":"\u003cp\u003eThe \u003cstrong\u003eYokogawa SARM55W-000\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003eSARM55W-000\u003c\/strong\u003e Relay Board, operates as a dedicated hardware component for 32-point contact output execution within process control systems.\u003c\/p\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSARM55W-000\u003c\/strong\u003e: Base designation for a 32-point mechanical relay board, configured for wet contact output operations with support for single or dual-redundant deployment.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eSARM55W-000\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eYokogawa\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eJAPAN\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e2.2 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e482.6 mm x 132.5 mm (3U)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 deg C to 50 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e24 VDC, Max 0.65 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContact Points\u003c\/td\u003e\n\u003ctd\u003e32-point\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField Terminals\u003c\/td\u003e\n\u003ctd\u003eM4 screws\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInsulation Resistance\u003c\/td\u003e\n\u003ctd\u003e10 MOhm (500 VDC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax AC Load\u003c\/td\u003e\n\u003ctd\u003e250 VAC, 0.6 A per point\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax DC Load\u003c\/td\u003e\n\u003ctd\u003e30 VDC, 0.6 A; 125 VDC, 0.1 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eProcess Control and Signal Isolation\u003c\/h3\u003e\n\u003cp\u003eThe SARM55W-000 incorporates high-density relay switching, supporting both single and dual-redundant configurations for critical output paths. The board architecture features channel-to-channel isolation to prevent propagation of electrical faults from field devices back to the controller backplane. Galvanic isolation is enforced between the field device terminals and the internal logic circuitry, with a withstand voltage of 2 kV. This isolation profile, combined with the 500 VDC insulation testing capability, ensures deterministic signal path behavior in complex DCS environments.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Does the SARM55W-000 support hot-swapping while the system is energized?\u003c\/p\u003e\n\u003cp\u003eA: No. Due to the nature of the mechanical relay contacts and the 24 VDC power distribution, the board must be isolated from the power supply and control bus before any installation or maintenance procedures are performed.\u003c\/p\u003e\n\u003cp\u003eQ: What is the minimum load requirement for the mechanical relay contacts?\u003c\/p\u003e\n\u003cp\u003eA: The contacts require a minimum load of 5 V at 10 mA to ensure stable contact closure and prevent premature oxidation of the mechanical relay surfaces.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eEnsure the board is mounted in a 3U-compliant rack enclosure, maintaining clearance for proper heat dissipation within the 0 deg C to 50 deg C ambient range.\u003c\/li\u003e\n\u003cli\u003eTerminate all field signal wires to the M4 screw terminals, ensuring a secure mechanical connection to prevent high-resistance contact points.\u003c\/li\u003e\n\u003cli\u003eVerify that the field device power supply is fused appropriately to protect the dual-line input, as the system supports a maximum current of 9.6 A for AC or 30 VDC loads.\u003c\/li\u003e\n\u003cli\u003eMaintain separation between high-voltage switching circuits and low-voltage logic signal wiring within the cabinet to prevent inductive noise injection.\u003c\/li\u003e\n\u003cli\u003eCheck that the insulation resistance exceeds 10 MOhm using a 500 VDC source before initial commissioning to confirm integrity against casing grounds.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":49253190893820,"sku":"SARM55W-000","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0787\/9983\/1292\/files\/SARM55W-000.jpg?v=1783302016","url":"https:\/\/www.electronicplc.com\/products\/sarm55w-000-mechanical-relay-board-yokogawa","provider":"Electronic PLC","version":"1.0","type":"link"}