{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"RM4TA31","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"RM4TA31","canonicalUrl":"https://aoctrl.com/schneider/RM4TA31","factsUrl":"https://aoctrl.com/api/mcp/products/RM4TA31","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric Harmony RM4-T series, RM4TA31 industrial measurement and control relay, 2 C/O output contacts, adjustable time delay 0.1...10 s, 50% fixed hysteresis, 22.5 mm width, IP20 terminals.","salesMarkdown":"## 22.5 mm control relay with adjustable timing The RM4TA31 is a Harmony RM4-T series industrial measurement and control relay from Schneider Electric, packing a 2 C/O output contact set into a 22.5 mm wide DIN-rail housing. The adjustable time delay spans 0.1 to 10 s, with a fixed 50% asymmetry hysteresis that governs the reset ratio — meaning the relay drops out at 50% of the pickup threshold, a non-negotiable parameter for sequence timing in pump control or conveyor interlock circuits. Rated for pollution degree 3 per IEC 60664-1 and overvoltage category III, it fits into industrial panels where transient immunity matters — the 2.5 kV dielectric test voltage confirms basic insulation between coil and contacts. The 90/10 silver-nickel contacts handle 250 V AC switching with a 10 mA minimum switching capacity at 12 V, so it reliably wets low-signal loads without contact oxidation over the 30 million-cycle mechanical endurance. ## Current production — sourcing posture Listed as current production (active lifecycle stage). ## Panel fit and environmental tolerance Depth is 80 mm (3.1 in), width 22.5 mm (0.9 in), height 78 mm (3.07 in) — the 22.5 mm footprint occupies one standard DIN-rail pitch, with 2.5 nine-mm pitches consumed. IP20 at the terminals, IP50 on the casing means it is protected against tools and wires but not washdown; install inside a sealed enclosure in wet environments. Operating position is any without derating, and the shock resistance is 15 gn for 11 ms per IEC 60068-2-27, so it survives moderate industrial vibration and impact. Supply frequency is 50/60 Hz ±5 %, with a 650 ms power-up delay before the output relay energises — this prevents nuisance tripping on brownout recovery. Time delay drift is ≤0.5 % within the measuring range, and the maximum measuring cycle is 80 ms, so the relay updates its output state within one mains cycle for most line frequencies. ## Compliance and documentation CE marked under the Low Voltage Directive 73/23/EEC and EMC Directive 89/336/EEC. Designed to IEC 60255-6 (measuring relays and protection equipment). Pollution degree 3 and overvoltage category III per IEC 60664-1. Screw terminals accept 2 x 1.5 mm² flexible with ferrule or 2 x 2.5 mm² flexible without ferrule; tightening torque range is 0.6 to 1.1 N·m.","metaTitle":"Schneider Electric RM4TA31 Harmony Control Relay, 2 C/O","metaDescription":"Schneider Electric RM4TA31 industrial measurement and control relay, 2 C/O contacts, adjustable 0.1-10 s time delay, 50% fixed hysteresis.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["General Purpose Relays"],"specifications":{"Depth":"3.1 in (80 mm)","Width":"0.9 in (22.5 mm)","Height":"3.07 in (78 mm)","Marking":"CE","Category":"22376-RELAYS-MEASUREMENT(RM4)","Standards":"IEC 60255-6","Directives":"73/23/EEC - low voltage directive 89/336/EEC - electromagnetic compatibility","Hysteresis":"50 % fixed asymmetry percentage","Relay Type":"Control relay","Relay name":"RM4-T","9 Mm Pitches":"2.5","Output contacts":"2 C/O","Time delay type":"Adjustable 0.1...10 s","lifecycle_stage":"current","Number of cables":"2","Pollution degree":"3 IEC 60664-1","Range of Product":"Harmony Relay","Shock resistance":"15 gn 11 ms IEC 60068-2-27","Supply frequency":"50/60 Hz +/- 5 %","Time delay drift":"<= 0.5 % within the measuring range","Contacts material":"90/10 silver nickel contacts","Delay At Power Up":"650 ms","Poles description":"3P","Relative humidity":"15...85 % 3K3 IEC 60721-3-3","Switching voltage":"250 V AC","Tightening torque":"5.3...9.7 lbf.in (0.6...1.1 N.m)","Operating position":"Any position without derating","Output relay state":"Tripped, fault present","Overvoltage category":"III conforming to IEC 60664-1","Vibration resistance":"0.35 ms (f= 10...55 Hz) conforming to IEC 60068-2-6","Mechanical durability":"30000000 cycles","Nbr. of units in pkg.":"1","Connections - terminals":"Screw terminals, 2 x 1.5 mm²flexible with cable end Screw terminals, 2 x 2.5 mm²flexible without cable end","Dielectric test voltage":"2.5 kV","IP degree of protection":"IP20 IEC 60529 terminals) IP50 IEC 60529 casing)","Maximum measuring cycle":"80 ms","Switching capacity in mA":"10 mA 12 V","Maximum switching voltage":"440 V AC","Product or Component Type":"Industrial measurement and control relays","Switching threshold drift":"<= 0.5 % within the measuring range","Non-dissipating shock wave":"4.8 kV","Relay monitored parameters":"Phase sequence Phase failure detection Asymmetry","Product Specific Application":"For 3-phase supply","Contacts type and composition":"2 C/O","Electromagnetic compatibility":"Electrostatic discharge - test level: 6 kV level 3 (contact discharge) conforming to IEC 61000-4-2 Electrostatic discharge - test level: 8 kV level 3 (air discharge) conforming to IEC 61000-4-2 Resistance to electrostatic discharge - test level: 6 kV (contact) conforming to IEC 61000-4-2 level 3 Resistance to electrostatic discharge - test level: 8 kV (air) conforming to IEC 61000-4-2 level 3","Resistance to fast transients":"2 kV IEC 61000-4-4 level 3","Time delay on de-energisation":"0.1...10 s","[Ui] rated insulation voltage":"500 V IEC","Disturbance radiated/conducted":"CISPR 11 group 1 - class A CISPR 22 - class A","Setting accuracy of time delay":"10 P","Terminals description ISO n°1":"(25-26-28)OC (15-16-18)OC (L1-L2-L3)CO","[Ie] rated operational current":"2 A 158 °F (70 °C) 24 V DC-13 IEC 60947-5-1/1991 2 A 158 °F (70 °C) 24 V DC-13 VDE 0660 3 A 158 °F (70 °C) 115 V AC-15 IEC 60947-5-1/1991 3 A 158 °F (70 °C) 115 V AC-15 VDE 0660 3 A 158 °F (70 °C) 24 V AC-15 IEC 60947-5-1/1991 3 A 158 °F (70 °C) 24 V AC-15 VDE 0660 3 A 158 °F (70 °C) 250 V AC-15 IEC 60947-5-1/1991 3 A 158 °F (70 °C) 250 V AC-15 VDE 0660 0.1 A 158 °F (70 °C) 250 V DC-13 IEC 60947-5-1/1991 0.1 A 158 °F (70 °C) 250 V DC-13 VDE 0660 0.3 A 158 °F (70 °C) 115 V DC-13 IEC 60947-5-1/1991 0.3 A 158 °F (70 °C) 115 V DC-13 VDE 0660","Adjustment of asymmetry threshold":"5...15 %","Ambient Air Temperature for Storage":"-40...185 °F (-40...85 °C)","Resistance to electromagnetic fields":"9.1 V/m (10 V/m) IEC 61000-4-3 level 3","Ambient air temperature for operation":"-4...149 °F (-20...65 °C)","Resistance to electrostatic discharge":"6 kV contact IEC 61000-4-2 level 3 8 kV air IEC 61000-4-2 level 3","Setting accuracy of the switching threshold":"+/-3 %","[Ith] conventional free air thermal current":"8 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$420.71","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://www.se.com/ca/en/product/RM4TA31/threephase-network-control-relay-rm4t-range-200-240-v/","alternativesUrl":"https://aoctrl.com/api/mcp/products/RM4TA31/alternatives.json"},"ai":{"faq":[{"question":"What is the adjustable time delay range on the RM4TA31?","answer":"The RM4TA31 offers an adjustable time delay from 0.1 to 10 seconds, with a fixed 50% asymmetry hysteresis. Drift is ≤0.5 % within the measuring range, and the maximum measuring cycle is 80 ms."},{"question":"What compliance documentation does the RM4TA31 carry?","answer":"CE marked under the Low Voltage Directive (73/23/EEC) and EMC Directive (89/336/EEC). Designed to IEC 60255-6 for measuring relays and protection equipment. Pollution degree 3 and overvoltage category III per IEC 60664-1."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/RM4TA31","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/schneider/RM4TA31 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}