{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"RM4UA31F","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"RM4UA31F","canonicalUrl":"https://aoctrl.com/schneider/RM4UA31F","factsUrl":"https://aoctrl.com/api/mcp/products/RM4UA31F","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric Harmony RM4UA31F voltage measurement relay, overvoltage or undervoltage detection, 2 C/O output contacts, adjustable hysteresis 5...30 %, adjustable time delay 0.05...30 s, 22.5 mm width, IP20 terminals.","salesMarkdown":"## What the adjustable settings mean for your panel The RM4UA31F is a voltage measurement relay from the Schneider Harmony series, designed to monitor a single-phase AC line for overvoltage or undervoltage conditions — you select which mode by wiring the monitored parameter input. Two adjustments on the front face set the trip point: hysteresis is adjustable from 5 to 30 % of the voltage threshold setting, and the time delay is adjustable from 0.05 to 30 s. That 30 s ceiling lets you ride through motor inrush or generator recovery without nuisance tripping. The output is two C/O (changeover) contacts rated for 440 V AC switching — enough to control a contactor coil or signal a PLC input directly. ## DIN-rail footprint and wiring The relay occupies 22.5 mm (0.9 in) on the DIN rail — a standard single-module width — so it fits tightly in a crowded panel without wasting space. Terminals accept up to 2 x 2.5 mm² flexible wire without a cable end, or 2 x 1.5 mm² with a ferrule; tighten to 0.6...1.1 N·m. The screw terminals are clearly marked per ISO n°1, so you can land the control and output wiring without chasing a diagram. IP20 at the terminals, IP50 on the casing — fine for a dry indoor cabinet; keep washdown zones outside the enclosure. ## Compliance and lifecycle status Pollution degree 3 per IEC 60664-1 means it is rated for the typical industrial panel environment where conductive pollution or dry non-conductive pollution that becomes conductive due to condensation is expected.","metaTitle":"Schneider Electric RM4UA31F Voltage Relay, 2 C/O, 22.5 mm","metaDescription":"RM4UA31F voltage measurement relay from Schneider Harmony series. Monitors over/undervoltage. 2 C/O contacts, adjustable hysteresis 5-30%, time delay 0.05-30 s.","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)","Category":"22376-RELAYS-MEASUREMENT(RM4)","Standards":"IEC 60255-6","Directives":"73/23/EEC - low voltage directive 89/336/EEC - electromagnetic compatibility","Hysteresis":"5...30 % adjustable voltage threshold setting","Relay Type":"Voltage measurement relay","Relay name":"RM4U","Time Delay":"Adjustable 0.05...30 s","9 Mm Pitches":"2.5","Output contacts":"2 C/O","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","Contacts material":"90/10 silver nickel contacts","Relative humidity":"15...85 % 3K3 IEC 60721-3-3","Tightening torque":"5.3...9.7 lbf.in (0.6...1.1 N.m)","Output relay state":"Tripped if A measured > A set","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)","Power consumption in VA":"1.9...3.3 VA AC","Switching capacity in mA":"10 mA 12 V","Internal input resistance":"43000 Ohm 6600 Ohm 71000 Ohm","Maximum switching voltage":"440 V AC","Product or Component Type":"Industrial measurement and control relays","Non-dissipating shock wave":"4.8 kV","Relay monitored parameters":"Overvoltage or undervoltage detection","Operating Voltage Tolerance":"0.85...1.1 Uc","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 fast transients":"2 kV IEC 61000-4-4 level 3","Disturbance radiated/conducted":"CISPR 22 - class A CISPR 11 group 1 - class A","Terminals description ISO n°1":"(15-16-18)OC (A1-A2)CO (C-B1-B2-B3)CO (25-26-28)OC","[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","Permissible continuous overload":"80 V 60 V 20 V","Protection against electric shocks":"2 kV level 3 IEC 61000-4-5","Ambient Air Temperature for Storage":"-40...185 °F (-40...85 °C)","Permissible non repetitive overload":"100 A 25 A 80 A 0.1 Uc","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","[Ith] conventional free air thermal current":"8 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$576.68","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://www.se.com/ie/en/product/RM4UA31F/voltage-measurement-relay-rm4u-range-0-05-5-v-110-130-v-ac/","alternativesUrl":"https://aoctrl.com/api/mcp/products/RM4UA31F/alternatives.json"},"ai":{"faq":[{"question":"What does the adjustable hysteresis on the RM4UA31F do?","answer":"The hysteresis is adjustable from 5 to 30 % of the voltage threshold setting. It sets the reset band — how far the measured voltage must return past the trip point before the output relay de-energizes. A wider hysteresis prevents relay chatter on a noisy or slowly recovering line."},{"question":"What is the width of the RM4UA31F?","answer":"The RM4UA31F is 22.5 mm (0.9 in) wide — a standard single-module DIN-rail footprint."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/RM4UA31F","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/RM4UA31F 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}}