{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"RM4UA31Q","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"RM4UA31Q","canonicalUrl":"https://aoctrl.com/schneider/RM4UA31Q","factsUrl":"https://aoctrl.com/api/mcp/products/RM4UA31Q","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric Zelio Control RM4UA31Q voltage measurement relay, 2 C/O contacts, adjustable hysteresis 5-30%, adjustable time delay 0.05-30 s, 22.5 mm wide, IP20 terminals.","salesMarkdown":"## Voltage monitoring relay with adjustable trip thresholds The RM4UA31Q is a voltage measurement relay from the Zelio Control range, designed for overvoltage or undervoltage detection in industrial control circuits. It monitors a single-phase AC supply and trips its output relays when the measured voltage crosses the set threshold. Two key adjustments let you tune the response: hysteresis is settable from 5 to 30 % of the threshold voltage, and the output time delay is adjustable from 0.05 to 30 s. This means you can prevent nuisance tripping on transient dips or surges while still catching sustained faults. ## Contact ratings and switching capacity The relay provides two changeover (2 C/O) output contacts with silver-nickel (90/10) material, rated for 3 A at 250 V AC-15 per IEC 60947-5-1 — the standard for switching electromagnetic loads like contactor coils and solenoid valves. At 24 V DC-13 (switching DC solenoids), the rating is 2 A. Minimum switching capacity is 10 mA at 12 V, which covers PLC digital inputs and low-power signal circuits. The maximum switching voltage is 440 V AC, so the contacts can handle line-voltage control circuits in most panel environments. ## Compliance and environmental ratings Designed to EN/IEC 60255-6 (measuring relays and protection equipment), the RM4UA31Q carries a dielectric test voltage of 2.5 kV and withstands a 4.8 kV non-dissipating shock wave. Pollution degree 3 per IEC 60664-1 means it is rated for industrial environments with conductive pollution. EMC compliance covers electrostatic discharge (6 kV contact / 8 kV air, level 3 per IEC 61000-4-2) and fast transients at 2 kV (level 3 per IEC 61000-4-4). The enclosure is IP50; the terminals are IP20 — suitable for installation inside a clean, dry panel.","metaTitle":"Schneider Electric RM4UA31Q Voltage Measurement Relay, 2 C/O","metaDescription":"Schneider Electric RM4UA31Q voltage measurement relay from Zelio Control series. Over/undervoltage detection, adjustable hysteresis 5-30%, time delay 0.05-30s.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","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":"EN/IEC 60255-6","Directives":"89/336/EEC - electromagnetic compatibility 73/23/EEC - low voltage directive","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":"Zelio Control","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","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":"2.7...3.4 VA AC","Switching capacity in mA":"10 mA 12 V","Internal input resistance":"43000 Ohm 71000 Ohm 6600 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 11 group 1 - class A CISPR 22 - class A","Terminals description ISO n°1":"(A1-A2)CO (25-26-28)OC (C-B1-B2-B3)CO (15-16-18)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":"60 V 80 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":"$235.94","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://www.se.com/ie/en/product/RM4UA31Q/voltage-measurement-relay-rm4u-range-0-05-5-v-380-415-v-ac/","alternativesUrl":"https://aoctrl.com/api/mcp/products/RM4UA31Q/alternatives.json"},"ai":{"faq":[{"question":"What does the adjustable hysteresis on RM4UA31Q do?","answer":"The hysteresis setting (5 to 30 % of the threshold voltage) defines the deadband between the trip point and the reset point. A wider hysteresis prevents the relay from chattering on a supply that hovers near the threshold; a narrower one gives tighter voltage regulation."},{"question":"What is the closest pin-compatible alternative to RM4UA31Q?","answer":"No official pin-compatible alternative or successor is listed by the manufacturer. The RM4UA31Q is the standard voltage monitoring relay in the Zelio Control range for single-phase over/undervoltage detection with 2 C/O contacts."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/RM4UA31Q","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/RM4UA31Q 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}}