Schneider RM17TA00 3-Phase Multifunction Supply Monitoring Relay

(Sequência de fases / Perda de Fase / 3-Phase Voltage Unbalance)

Série: Zelio Control / Harmony RM17T Series, montado em trilho DIN 3-phase monitoring relay, commonly known as phase sequence protector.

✅ Monitoring Functions

Phase sequence detection (L1-L2-L3): Instant trip upon reverse phase sequence

Phase loss detection: Instant trip if any phase is lost (including phase loss with regenerated voltage from motors)

3-phase voltage asymmetry (desequilíbrio): Adjustable threshold from 5% para 15% of Un, with time-delayed tripping

Logic rule: Inversão de fase / phase loss → instantaneous trip; voltage unbalance → delayed trip.

📌 Key Electrical Specifications

Monitoring voltage range: AC 208～480V (operating limit: 183～528V AC)

Freqüência: 50/60 Hz (±10%)

Output contact: 1 C/O (SPDT), 5UM / 250VAC

Time delay adjustment: 0.1～10s (only for unbalance faults)

Reset delay: Aprox.. 1.5é

Consumo de energia: ≤22VA @ 400V 50Hz

Montagem: Trilho DIN 35mm; largura 17,5 mm (1 largura do módulo)

Indicação: Status LED; sealed transparent cover prevents accidental parameter changes

🧮 RM17T Series Selection Comparison (Chave para seleção de modelo)

RM17TT00: Sequência de fase + perda de fase (NO unbalance monitoring)

RM17TA00 (Modelo Atual): Sequência de fase + perda de fase + 3-phase voltage asymmetry

RM17TU00: Sequência de fase + perda de fase + subtensão

RM17TE00: Sequência de fase + perda de fase + asymmetry + sobretensão + subtensão (full-function model)

🛠️ Cenários típicos de aplicação

Elevadores, hoisting & equipamento de transporte, compressores de ar, bombas de água, unidades de refrigeração, máquinas de embalagem; prevents motor reverse rotation, burnout from phase loss, and overheating caused by three-phase unbalance.

🔌 Wiring Guidelines

1. Connect L1/L2/L3 directly to the monitored three-phase supply (autoalimentado, no separate auxiliary supply required).
2. Terminais 15/16/18 form one changeover contact: 15-16 = normally closed; 15-18 = normally open.
3. Panel setting: First select rated voltage (208/220/380/400/415/480V), then set unbalance threshold and fault delay time.
4. Fault recovery: Automatic reset once power returns to normal; no manual reset button.

⚠️ Solução de problemas

Relay does not energize after power-up: Check phase sequence, perda de fase, and voltage range dip switch setting.

Frequent tripping during normal operation: Increase unbalance percentage threshold, extend time delay, and investigate single-phase load current imbalance.

No LED illumination: Three-phase input voltage exceeds the 183~528V operating range.

📎 Replacement Options

Direct upgraded replacement within the same product line: RM22TA33 (RM22 series, same functions with 2 C/O contacts).

Alternativas domésticas: Chint / Delixi three-phase phase-sequence & unbalance monitoring relays.

1. Full Model List of RM17T Series

(3-phase supply monitoring relays, 17.5mm single-module width, Montagem em trilho DIN)

1) Modelo Básico: RM17TG (Only phase sequence + perda de fase; no unbalance / undervoltage monitoring)

RM17TG00: 1 C/O changeover contact, 208～480V AC

RM17TG20: 2 Contatos de comutação duplos C/O, 208～440V AC

2) Multifunction Models (RM17TT / ENFRENTANDO / TU / O, 208～480V AC, 1 C/O contact uniformly)

Abbreviation explanation:

TU = T + Subtensão

TE = T + Everything (funções completas)

III. Common Specifications for the Whole Series (All Models Identical)

Faixa de tensão: AC 208～480V (operating limit 183～528V)

Avaliação de contato: 5UM / 250VAC; RM17TG00/TT/TA/TU/TE = 1 C/O; only RM17TG20 = 2 C/O

Largura: 17.5milímetros (1P module)

Modo de reinicialização: Automatic reset after fault clears; no manual reset button

1. Upgraded Replacement Models (RM22 Series with Extra Contacts)

RM17TA00 → RM22TA33 (2 C/O contacts)

RM17TU00 → RM22TU23

RM17TE00 → RM22TE33

RM17TA00 Overall Dimensions (L × A × P)

17.5 milímetros × 90 milímetros × 72 milímetros

Largura: 17.5 milímetros (1-pole module, same width as 1P MCB)

Altura: 90 milímetros

Profundidade (from DIN rail front face): 72 milímetros

Montagem: DIN35 standard rail

Peso líquido: Aprox.. 0.13 kg

✅ All models in RM17T series (RM17TT00 / RM17TU00 / RM17TE00 / RM17TG00) share identical dimensions.

Core Positioning of RM17TA00

It provides phase sequence + perda de fase + three-phase voltage unbalance protection, mainly for three-phase asynchronous motors. It prevents reverse rotation, motor burnout from phase loss, and overheating caused by long-term voltage imbalance. Autoalimentado, compact 1-module DIN rail design, ideal for compact control cabinets and retrofitting projects where no PLC signal collection is needed.

1. Indústria & Aplicações de equipamentos
2. Içamento & Transporte (Aplicação Primária)

Overhead cranes, talhas elétricas, transportadores de correia, empilhadores, elevadores; prevents motor reverse rotation after phase reconnection and overheating damage to gearboxes and motors due to long-term unbalance.

2. Elevadores & Plataformas Elevatórias

Freight elevators, simple lifting platforms, parking lift power circuits; wrong phase sequence causes reverse car movement; voltage unbalance leads to excessive temperature rise of traction motors.

3. Bombas de água & Estações de bombeamento

Bombas centrífugas de alta potência, submersible sewage pumps, pre-power monitoring before variable-frequency drives; unbalance is frequently caused by mixed single-phase loads in water supply, sewage treatment and chiller pump systems.

4. Compressores de ar & HVAC Refrigeration Units

Screw air compressors, refrigeradores de água, air-source heat pumps, compressores de refrigeração; compressors are highly sensitive to three-phase unbalance, which easily burns out motor windings.

5. Embalagem, Têxtil & Automação de marcenaria

Linhas de embalagem, máquinas têxteis, extrusoras, equipamento auxiliar de moldagem por injeção; frequent power maintenance and phase swapping require phase sequence verification before power-on.

6. Cargas de ventilador

Exaustores, induced draft fans, drying fans; large inertia fans produce regenerated voltage after phase loss; this model supports phase loss detection under regenerated voltage conditions.

7. Control Panels & Correspondência de equipamentos OEM

380V three-phase control cabinets, non-standard automation OEM factory-fitted protection; old equipment retrofits, hard-contact interlock without adding PLC analog modules.

1. Selection Boundary: Adequado / Cenários inadequados

✅ Recomendado:

Three-phase motor loads with risks of voltage asymmetry overheating (core advantage over RM17TT00)

Supply voltage AC 208~480V, 50/60Hz

Espaço limitado no gabinete, apenas 1 module width available

Hard-contact interlock directly wired into main contactor coil circuit

❌ Não recomendado:

Sobretensão + undervoltage monitoring required → choose RM17TE00

Only undervoltage protection without unbalance → choose RM17TU00

Dual independent alarm contacts required → upgrade to RM22TA33 (2C/O)

Motors behind variable-frequency drives: VFDs already have built-in phase loss & proteção contra desequilíbrio; extra relay is generally unnecessary.

III. Typical Control Logic

Contact wired in series with the main contactor coil circuit:

Normal power supply → relay energizes and closes, contactor power permitted;

Inversão de fase / perda de fase / voltage unbalance detected → relay de-energizes and opens, cutting off main power, with dry contacts available for PLC or audible-visual alarm signals.