Relè di controllo Schneider CA4KN31BW3

CA4KN: Serie TeSys K control relay

31: Configurazione dei contatti: 3 NO + 1 NC

B: 24 V DC low-consumption coil with built-in bidirectional freewheeling diode

W3: Screw clamping terminals

Parametri tecnici fondamentali

Bobina: 24 V DC low-power coil, integrated bidirectional peak suppression diode

Disposizione dei contatti: 3 Normalmente aperto + 1 Normalmente chiuso (3NA+1NC), 4-palo

Corrente termica convenzionale Ith: 10 UN (A 50 °C)

Tensione nominale di isolamento Ui: 690 V

Utilisation category: AC-15 / DC-13 (standard control circuit loads)

Montaggio: DIN35 rail mounting or base plate fixing

Cablaggio: Morsetti a vite, coppia di serraggio 1.3 N·m

Dimensioni: W45 mm × H58 mm × D57 mm

Resistenza meccanica: 20 milioni di operazioni

Recommended protection: 10 A gG fuse

Origine: Indonesia

Applicazioni tipiche

PLC digital output expansion, signal isolation & trasferire, logic interlocking, indicator lamp driving, small solenoid/coil actuation. It is an auxiliary control relay, not intended for high-power main circuits. It shares the same footprint as TeSys K contactors and can be installed side-by-side.

Cross-reference for Replacement & Selezione

CA4KN22BW3: 2NO+2NC, 24 A DC, terminali a vite

CA4KN40BW3: 4NO, 24 A DC, terminali a vite

CA4KN31BN3: Spring-cage terminal version (replaces W3)

Customs HS Code

Codice SA: 85364190 (Electromagnetic relays, rated voltage ≤60 V)

Sostituzioni comuni

Alternative domestiche: Cinto / Delizioso 24 V DC control relays with 3NO+1NC contact configuration.

Schneider direct upgrade: other coil variants within the CA4KN series (per esempio., 110 A DC).

Typical Application Cases for CA4KN31BW3 (3NA+1NC, 24 V DC Low-Consumption Control Relay)

Key advantages: built-in bidirectional freewheeling diode, basso consumo energetico della bobina, direct PLC DO driving; 3NO+1NC allows 3 output channels plus 1 feedback channel; AC-15/DC-13 rated, frequenza operativa massima: 180 cicli al minuto.

Caso 1: PLC Digital Output Port Expansion (Più comune)

Scenario: Insufficient PLC DO points; DO ports have low current capacity (<0.5 UN) and need to drive multiple contactor coils and solenoid valves simultaneously.

Cablaggio: PLC 24 V DO connected to relay coil terminals A1/A2

Contact assignment:

NO1: Drive LC1D contactor coil

NO2: Guidare 24 V DC solenoid valve

NO3: Run indicator lamp

NC1: Feedback to PLC DI for relay status monitoring (rottura del filo / contact sticking diagnosis)

Highlights: Low-power coil avoids overloading PLC outputs; built-in diode eliminates external surge suppression circuits; same TeSys K form factor for neat cabinet layout, standard panel builder solution.

Industrie: Macchine utensili, macchine per l'imballaggio, assembly line control cabinets.

Caso 2: Auxiliary Logic Interlock & Status Collection for Main Contactors

Scenario: Main LC1D contactors have insufficient built-in auxiliary contacts; additional interlocking, fault feedback and on/off indication are required.

Driving signal: Circuito di arresto di emergenza / safety relay output energises the CA4KN coil

Contact assignment:

NO1: Enable forward rotation circuit

NO2: Enable reverse rotation circuit

NO3: Contactor ON run lamp

NC1: Wired into reverse circuit for hardware interlock (prevents simultaneous forward & reverse operation)

Nota: This is only control-circuit interlocking and cannot replace main-circuit electrical interlocks.

Industrie: Attrezzature di trasporto, piccoli meccanismi di sollevamento, fan & pump control panels.

Caso 3: Fan & Damper Interlock Control for HVAC Air Handling Units

Scenario: DDC controller outputs control damper actuators, fan contactors and alarm lamps, with one status feedback channel to the building BA system.

Driving signal: 24 V DC output from DDC energises CA4KN31BW3

Contact assignment:

NO1: Damper open command

NO2: Fan contactor coil

NO3: Running status lamp

NC1: DI input to BA system for stop / fault feedback

Vantaggi: High noise immunity with built-in diode, suitable for frequent switching in weak-current building control loops; ampio intervallo di temperature di esercizio (-25 °C~ +50 °C) for indoor plant rooms.

Industrie: Automazione degli edifici, clean air conditioning, fresh air handling units.

Caso 4: Primary & Standby Pump Rotation Control Relay

Scenario: Level controller / PLC output switches main pump, standby pump and alarm circuits with independent status feedback.

Logica: High water level signal energises the relay coil

NO1: Main pump start

NO2: Standby pump activation (coordinated with delay circuit)

NO3: Overflow alarm lamp

NC1: Relay fault detection signal to PLC

Industrie: Sewage lifting, trattamento dell'acqua, water supply control panels.

Caso 5: Signal Expansion after Safety Relay Outputs

Scenario: XPS safety relay has limited output contacts; safety OK signals need to be duplicated to inverter enable, alarm and HMI status channels.

Driving signal: Safety relay OK output energises CA4KN coil

NO1: Inverter STO / enable signal

NO2: Safety OK indicator lamp

NO3: HMI DI safety status input

NC1: Safety circuit trip alarm

Critical reminder: Safety judgment remains the responsibility of the XPS safety relay; CA4KN only serves as signal transfer and cannot be used as a safety component alone.

Industrie: Linee di produzione automatizzate, robot peripherals, cutting machinery.

Caso 6: Isolated Passive Signal Transfer for Variable Frequency Drives / Soft Starters

Scenario: VFD relay output is a dry contact; multiple isolated signals need to be sent to PLC, local alarms and data loggers, with mixed AC/DC circuits.

Driving signal: VFD “Correre” dry contact controls the relay coil

NO1: PLC DI running signal

NO2: Local AC220 V run indicator

NO3: Remote SCADA transmission signal

NC1: Stop status signal

Valore: Galvanic isolation between 24 V coil side and contact side, preventing electrical noise from coupling into the VFD mainboard.

Selezione & Application Best Practices (Frequent Engineering Pitfalls)

1. Tipo di carico: Only for control circuit loads (bobine del contattore, solenoidi, spie luminose); never for main power circuits. Corrente termica nominale: 10 UN, utilisation category AC-15.
2. Coil note: BW3 = 24 V DC low-consumption with built-in bidirectional diode. Do NOT add external LAD4RC surge suppressors, as specified in Schneider official documentation.
3. Terminali: W3 = screw terminals; spring-cage alternative: CA4KN31BN3.
4. Contact logic for 3NO+1NC: 3 output channels + 1 feedback channel, the most widely used contact allocation for automation panels.
5. Montaggio: DIN35 rail installation; can be mounted side-by-side with LC1K contactors for consistent cabinet layout.

TeSys K Control Relays (CA2KN / CA3KN / CA4KN) – Full Model Coding Rule

Formato del modello completo: CAu KNvw + voltage code + terminal suffix

1. u = Coil Type

CA2KN: Bobina CA (50/60 Hz)

CA3KN: Standard DC coil (normal power consumption)

CA4KN: Low-consumption DC coil (built-in bidirectional freewheeling diode, PLC direct drive preferred; CA4KN31BW3 falls into this category)

2. vw = Contact Combination (soltanto 3 fixed configurations)

40: 4NO (4 Normalmente aperto)

31: 3NA+1NC (3 Aprire + 1 Chiuso, più popolare)

22: 2NO+2NC (2 Aprire + 2 Chiuso)

3. Codice tensione + Terminal Suffix (Key Part)

W3: Screw clamping terminals

N3: Terminali a molla

Suffisso “3” = built-in surge suppression diode

Configurazioni dei contatti (Soltanto 3 Options for the Whole Series)

1. 40 = 4NO
2. 31 = 3NO+1NC (CA4KN31BW3 uses this configuration)
3. 22 = 2NO+2NC

Elenco completo dei modelli: CA4KN Low-Consumption DC Coil (PLC Version, Built-in Diode)

Bobina: DC low power, integrated bidirectional freewheeling diode; Terminali: W3 screw / N3 spring cage

1) 24 A DC (Il più popolare: BW3 / BN3)

2) 48 A DC (EW3 / EN3)

CA4KN40EW3 / CA4KN40EN3

CA4KN31EW3 / CA4KN31EN3

CA4KN22EW3 / CA4KN22EN3

3) 72 A DC (SW3 / SN3)

CA4KN40SW3 / CA4KN40SN3

CA4KN31SW3 / CA4KN31SN3

CA4KN22SW3 / CA4KN22SN3

Nota: CA4KN series only offers 12/24/48/72 V DC low-consumption variants; no AC coil versions. CA4KN was discontinued at the end of 2024; new projects shall adopt CA3KN models with suffix “3” as direct replacements.

CA3KN Standard DC Coil (Normal Power, Built-in Diode Suffix “3”)

Voltage Codes (Vite: BD/ED/FD…; Primavera: BD3/ED3…)

12 A DC: JD / JD3

24 A DC: B.D / BD3 (Top replacement: CA3KN31BD3 for CA4KN31BW3)

48 A DC: ED / ED3

110 A DC: FD / FD3

125 A DC: GD / GD3

220 A DC: MD / MD3

Full Model Examples (3 Contact Types)

1. 24 V DC screw terminals (with built-in diode)

CA3KN40BD3 (4NO)

CA3KN31BD3 (3NA+1NC, direct replacement for CA4KN31BW3)

CA3KN22BD3 (2NO+2NC)

2. Terminali a molla: keep the voltage code unchanged, only adjust terminal suffix; per esempio., CA3KN31BD3 (vite) and spring-cage variant share the same voltage code.

CA2KN AC Coil (50/60 Hz, Main Control Circuits)

Common Voltage Codes

24 V e: B7

48 V e: E7

110 V e: F7

220/230 V e: M7 / P7 (most used: CA2KN31P7)

380 V e: D7

Full Contact Models (Bobina CA)

4NO: CA2KN40B7 / CA2KN40P7

3NA+1NC: CA2KN31B7 / CA2KN31P7

2NO+2NC: CA2KN22B7 / CA2KN22P7

Terminal Differentiation (W3/N3 vs Non-Suffix “3”)

1. W3 = Screw clamping terminals (CA4KN31BW3)
2. N3 = Spring-cage quick connect terminals (sostituzione: CA4KN31BN3)
3. Models without trailing “3”: No built-in diode; external RC snubber is mandatory for DC circuits – not recommended for direct PLC DO driving.

Discontinuation Replacement Solution (Field Retrofit)

Modello originale: CA4KN31BW3 (24 V DC low-consumption, 3NA+1NC, terminali a vite)

✅ Direct drop-in replacement: CA3KN31BD3 (24 Bobina standard da Vcc + diodo incorporato, 3NA+1NC, terminali a vite; identical footprint, plug-and-play interchange)

Specifiche Tecniche Generali (Uniform for All TeSys K Control Relays)

Contact utilisation category: AC-15 / DC-13 (control circuit only)

Corrente termica convenzionale: 10 UN (A 50 °C)

Tensione di isolamento nominale: 690 V

Montaggio: DIN35 rail or base plate fixing

Larghezza complessiva: 45 mm, same form factor as LC1K contactors for side-by-side mounting

Resistenza meccanica: 20 milioni di operazioni