{"product_id":"yokogawa-sarm55-mechanical-relay-board","title":"Yokogawa SARM55 Mechanical Relay Board","description":"\u003cp\u003eThe \u003cstrong\u003eYokogawa SARM55\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003eARM55C\u003c\/strong\u003e Mechanical Relay Board, operates as a dedicated hardware component for multi-channel discrete output execution within Yokogawa industrial control platforms. The solid-state interface assembly processes binary logic commands to route physical dry contact outputs over external switching circuits.\u003c\/p\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\u003eSARM55\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 (Standard 19 inch rack, 3U height profile)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 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 internal circuit power, Max. 0.65 A current draw\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContact Points\u003c\/td\u003e\n\u003ctd\u003e32 point discrete output matrix\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContact Type\u003c\/td\u003e\n\u003ctd\u003eForm a (Normally Open) or Form b (Normally Closed) dry contacts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum AC Load\u003c\/td\u003e\n\u003ctd\u003e250 VAC at 2 A per point\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum DC Load\u003c\/td\u003e\n\u003ctd\u003e30 VDC at 2 A | 125 VDC at 0.1 A per point\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMinimum Loop Load\u003c\/td\u003e\n\u003ctd\u003e5 VDC, 10 mA electrical threshold\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInsulation Resistance\u003c\/td\u003e\n\u003ctd\u003eAt least 10 MOhm (Evaluated at 500 VDC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWithstanding Voltage\u003c\/td\u003e\n\u003ctd\u003eField to Case: 2 kV | Power to Case: 500 V | Power to Field: 2 kV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField Terminals\u003c\/td\u003e\n\u003ctd\u003eM4 screw connection layout\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule Compatibility\u003c\/td\u003e\n\u003ctd\u003eADV551 (with ATD5A block) | ADV561 digital output cards\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSignal Interconnects\u003c\/td\u003e\n\u003ctd\u003eAKB331 (32 point link) | AKB337 (64 point link) cables\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRegulatory Standards\u003c\/td\u003e\n\u003ctd\u003eEMC Standards [CE Marking], [C-Tick Marking], [KC Marking]\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eDigital I\/O Cards\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eProcess Control \u0026amp; DCS Instrumentation Rails\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eChannel-to-Channel Isolation and Noise Suppression\u003c\/strong\u003e The board infrastructure implements structural galvanic isolation limits rated at 2 kV between the M4 field device terminals and the internal system logic. This barrier prevents high-voltage transient surges, electrical switching noise, and common-mode voltage offsets from bleeding back into adjacent channels or degrading nearby low-level measurement loops.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-20 mA HART Loop Protocol Coexistence\u003c\/strong\u003e By providing clean mechanical dry contacts, the assembly prevents electrical cross-talk within cabinets housing 4-20 mA HART loop protocol lines. The high insulation resistance of 10 MOhm at 500 VDC ensures that switching heavy inductive loads does not introduce harmonic distortions or loop leakage currents into adjacent distributed control system (DCS) analog instrumentation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: How does the minimum load requirement impact low-power signaling circuits?\u003c\/p\u003e\n\u003cp\u003eA: The contacts require a minimum loop load of 5 V, 10 mA to function reliably. Attempting to switch electronic signals below this threshold can lead to intermittent continuity over time, as the loop lacks the electrical wetting energy necessary to pierce microscopic surface oxide layers that build up naturally on electromechanical contact surfaces.\u003c\/p\u003e\n\u003cp\u003eQ: What structural behavior occurs if the internal 24 VDC logic power grid fails?\u003c\/p\u003e\n\u003cp\u003eA: The internal logic circuits operate on a nominal 24 VDC rail with a maximum current draw of 0.65 A. If this internal control power supply is interrupted or drops below minimum operational thresholds, the electromagnetic coils de-energize immediately, reverting all 32 channels to their default unpowered safe states to guarantee predictable contact positions.\u003c\/p\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":47641429573822,"sku":"SARM55W","price":3000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0725\/1145\/5422\/files\/screenshot_2026-06-16_10-05-38_ab72766b-12af-4ad7-84ff-6135a3fbdb66.png?v=1781577617","url":"https:\/\/www.autooiltech.com\/ar\/products\/yokogawa-sarm55-mechanical-relay-board","provider":"AutoOilTech Limited","version":"1.0","type":"link"}