EATON EMT6-KDB Motor Protection Relay

(Ordine n.: 269471)

Tipo di prodotto: Thermistor (PTC) Relè di protezione del motore, Ex Explosion-proof, Dual Sensor Circuit

Eaton Moeller EMT6 series for PTC thermistor temperature monitoring of motor windings.

K = ATEX explosion-proof certification; DB = Dual sensor input circuit

✅ Model Code Explanation

EMT6: Serie, PTC thermistor motor protection relay

K: Certificato ATEX, suitable for Ex e explosion-proof motor applications

DB: Two independent PTC sensor input circuits (simultaneously monitor 2 temperature points, per esempio. stator + bearing, or pre-alarm + viaggio)

Codice ordine: 269471

✅ Key Features

Dual PTC circuit monitoring, two sensor channels evaluated independently to support pre-warning and protection logic
Sensor wire break and short-circuit detection (unique to K variants: detects not only wire breakage but also short circuits of sensor cables)
Zero-voltage safety protection (undervoltage lockout): the relay will not auto-reset after tripping due to power loss; configurable via DIP switch
Resettable modes: local manual reset / remote reset
Front panel Test/Reset button for commissioning to simulate over-temperature faults
LED di stato: power indication, indicazione di guasto
SIL 1 livello di sicurezza (IL TUO 50495), suitable for temperature protection of explosion-proof equipment

✅ Electrical Specifications

Tensione di alimentazione: 24～240V AC/DC wide range

Contatto ausiliario: 1NO + 1NC (contatto di scambio), rated thermal current 6A

Tipo di sensore: PTC thermistor (130℃ / 150℃ PTC embedded in motor windings)

Thresholds: Over-temperature trip >1330OH; reset <550OH; sensor short-circuit fault <50OH

Montaggio: Montaggio a scatto su guida DIN, width 22.5mm

Terminali: Morsetti a vite, tightening torque 1.2Nm

Protezione della custodia: IP20 (solo per installazione in armadio)

Temperatura ambiente: Operating -25℃ ~ +60℃ (massimo. +45℃ for tightly sealed cabinets)

Standard: CEI/EN 60947-8, ATEX, CE, UL, Certificazione CCC

✅ Applications

Winding temperature protection for Ex-e increased safety explosion-proof motors (primary use case for K models)

Temperature protection for motors, gearboxes, pumps and fans via PTC thermistors

Dual-point temperature monitoring: per esempio. one channel for winding over-temperature trip, one channel for bearing pre-alarm

Thermal protection for equipment in chemical, farmaceutico, coal and other explosion hazardous areas

✅ Comparison of Related Series Models

Modello	Ordine n.	NO. of Circuits
EMT6-K	269470	Separare
EMT6-KDB	269471	Doppio
EMT6-DB	66167	Doppio
EMT6-DBK	66168	Doppio

✅ Troubleshooting Guide

No LED on power-up: Check supply voltage 24~240V AC/DC
Fault LED steady ON:

PTC over-temperature (resistenza >1330OH)

Sensor circuit wire break

Sensor cable short-circuit (KDB exclusive detection function)

Cannot reset after trip: Zero-voltage lockout is activated; power cycle or disable undervoltage lockout via DIP switch
Funzione di prova: Press front Test button to simulate over-temperature and trigger relay trip

✅ Alternative Selection Reference

Same brand alternative: EMT6-DBK (without ATEX explosion-proof certificate, other functions similar)

Alternativa domestica: Domestic dual-channel PTC motor protection relay (nota: for explosion-proof applications, domestic alternative must provide valid ATEX certificate for direct replacement of EMT6-KDB)

EATON EMT6-KDB Ambient Temperature Specifications

Open ventilated cabinet operating ambient temperature: -25℃ ～ +60℃
Sealed cabinet installation (scarsa dissipazione del calore): -25℃ ～ +45℃ (reduced upper limit)
Temperatura di conservazione: -45℃ ～ +85 ℃

Note supplementari:

Under UL/CSA certified operating conditions, the nominal rated ambient temperature on nameplate is 40℃

For ATEX explosion-proof applications, ATEX code ambient limits must be followed, not solely the 60℃ upper limit

EATON EMT6 Full Series Model List (PTC Thermistor Motor Protection Relay)

Abbreviation Definition

K: ATEX explosion-proof certified, supports sensor cable short-circuit detection

DB: Dual PTC sensor circuit

EMT62: Dual normally open contact version

(230V): Fixed 230V AC supply; no suffix = wide voltage 24~240V AC/DC

Modello	Ordine n.	Sensor Circuits	Alimentazione elettrica	Descrizione
EMT6	66166	Separare	24~240 V CA/CC	Modello base, nessun rilevamento di cortocircuito, non antideflagrante
EMT6(230V)	66400	Separare	230V e	Single circuit, fixed 230V power supply
EMT6-DB	66167	Doppio	24~240 V CA/CC	Dual circuit, nessun rilevamento di cortocircuito, non antideflagrante
EMT6-DB(230V)	66401	Doppio	230V e	Dual circuit, fixed 230V power supply
EMT6-DBK	66168	Doppio	24~240 V CA/CC	Dual circuit with sensor short-circuit detection, no ATEX
EMT6-K	269470	Separare	24~240 V CA/CC	Single circuit, Certificato ATEX, with short-circuit detection
EMT6-KDB	269471	Doppio	24~240 V CA/CC	Dual circuit + ATEX + rilevamento di cortocircuiti (target model)
EMT62	171889	Separare	24~240 V CA/CC	Single circuit, dual NO output contacts
EMT62-DB	171890	Doppio	24~240 V CA/CC	Dual circuit, dual NO output contacts

Guida alla selezione rapida

Zona a rischio di esplosione (Ex-e motor) → EMT6-K / EMT6-KDB
Industria generale, require sensor cable short-circuit detection → EMT6-DBK
Industria generale, dual temperature monitoring, short-circuit detection not required → EMT6-DB
Two independent normally open alarm outputs required → EMT62 / EMT62-DB

EATON EMT6-KDB (Order No.269471) Dimensioni fisiche

Montaggio su guida DIN; housing dimensions identical across all EMT6 variants

Larghezza(W): 22.5 mm (nominal 23mm, standard 22.5mm DIN rail module width)

Altezza(H): 83 mm

Profondità(D): 103 mm (measured from DIN rail mounting surface to front face)

✅ Weight: 0.13 kg approx.

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