{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"RM4LG01M","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"RM4LG01M","canonicalUrl":"https://aoctrl.com/schneider/RM4LG01M","factsUrl":"https://aoctrl.com/api/mcp/products/RM4LG01M","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric Harmony Relay RM4-L series, RM4LG01M liquid level control relay, 1 C/O output, sensitivity 5...100 kOhm, 22.5 mm width, DIN-rail mount.","salesMarkdown":"## Liquid level control relay — what the sensitivity range means The RM4LG01M is a liquid level control relay from Schneider Electric's Harmony Relay range, designed to detect conductive liquid levels via resistive probes. Its sensitivity scale of 5...100 kOhm sets the probe resistance threshold at which the relay changes state — a 5 kOhm setting triggers on low-resistance (highly conductive) liquids like salt water, while 100 kOhm suits demineralised water or weak solutions. The single C/O output contact switches loads up to 250 V AC, with a maximum switching voltage of 440 V AC. The electrode circuit is limited to 24 V AC and 1 mA — safe for probe immersion without electrolysis damage. ## DIN-rail fit and panel integration At 22.5 mm wide (0.9 in), the RM4LG01M occupies a single 9 mm pitch module on a DIN rail — 2.5 pitches total. Screw terminals accept up to 2 x 2.5 mm² flexible wire without cable end, or 2 x 1.5 mm² with ferrule. Tightening torque is 0.6...1.1 N·m. IP20 at the terminals, IP50 on the casing — suitable for enclosed panel use, not washdown. Pollution degree 3 and overvoltage category III per IEC 60664-1 mean it handles industrial environments with conductive contamination and transient overvoltages up to 4 kV.","metaTitle":"Schneider Electric RM4LG01M Liquid Level Control Relay","metaDescription":"Schneider Electric RM4LG01M liquid level control relay, 1 C/O output, sensitivity 5...100 kOhm, 22.5 mm wide, DIN-rail mount.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["General Purpose Relays"],"specifications":{"Width":"0.9 in (22.5 mm)","Marking":"CE : EMC 89/336/EEC CE : LVD 73/23/EEC","Category":"22376-RELAYS-MEASUREMENT(RM4)","Standards":"EN/IEC 60255-6","Relay Type":"Liquid level control relay","Relay name":"RM4-L","Time Delay":"Without","9 Mm Pitches":"2.5","Output contacts":"1 C/O","lifecycle_stage":"current","Number of cables":"2","Pollution degree":"3 IEC 60664-1","Range of Product":"Harmony Relay","Contacts material":"90/10 silver nickel contacts","Power Consumption":"2.4 VA AC","Relative humidity":"15...85 % 3K3 IEC 60721-3-3","Sensitivity scale":"5...100 kOhm","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":"According to chosen function","Overvoltage category":"III conforming to IEC 60664-1","Mechanical durability":"30000000 cycles","Nbr. of units in pkg.":"1","Maximum cable capacity":"0 mF","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)","Switching capacity in mA":"10 mA 12 V","Maximum electrode current":"1 mA","Maximum electrode voltage":"24 V AC","Maximum switching voltage":"440 V AC","Product or Component Type":"Industrial measurement and control relays","Relay monitored parameters":"Detection by resistive probes","Supply disconnection value":"> 0.1 Uc","Operating Voltage Tolerance":"0.85...1.1 Uc","Contacts type and composition":"1 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","[Ui] rated insulation voltage":"500 V IEC","Disturbance radiated/conducted":"CISPR 22 - class A CISPR 11 group 1 - class A","Terminals description ISO n°1":"(B1-B2-B3)CO (15-16-18)OC (A1-A2)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","Protection against electric shocks":"2 kV level 3 IEC 61000-4-5","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","[Ith] conventional free air thermal current":"8 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$190.93","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://www.se.com/ae/en/product/RM4LG01M/liquid-level-control-relay-rm4l-220-240-v-ac/","alternativesUrl":"https://aoctrl.com/api/mcp/products/RM4LG01M/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy RM4LG01M and how do I get a price?","answer":"The RM4LG01M is sourced to order against your BOM quantity through independent distribution. Submit an RFQ for current availability and pricing — confirmed at quote time."},{"question":"What is RM4LG01M's sensitivity range and what does it mean for probe selection?","answer":"The sensitivity scale is 5...100 kOhm. A lower setting (5 kOhm) triggers on highly conductive liquids; a higher setting (100 kOhm) works with low-conductivity liquids like demineralised water. The electrode circuit is limited to 24 V AC and 1 mA to prevent probe corrosion."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/RM4LG01M","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/RM4LG01M 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}}