Releu de control Schneider CA4KN31BW3

CA4KN: TeSys K series control relay

31: Configurarea contactului: 3 NU + 1 NC

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

W3: Screw clamping terminals

Parametrii tehnici de bază

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

Contact arrangement: 3 Deschis normal + 1 În mod normal închis (3NU+1NC), 4-pol

Curentul termic convențional Ith: 10 O (la 50 °C)

Tensiunea nominală de izolație Ui: 690 V

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

Montare: DIN35 rail mounting or base plate fixing

Cablaj: Borne cu șuruburi, cuplul de strângere 1.3 N·m

Dimensiuni: W45 mm × H58 mm × D57 mm

Rezistenta mecanica: 20 milioane de operațiuni

Recommended protection: 10 A gG fuse

Origine: Indonezia

Aplicații tipice

PLC digital output expansion, signal isolation & transfer, 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 & Selecţie

CA4KN22BW3: 2NU+2NC, 24 În DC, terminale cu șuruburi

CA4KN40BW3: 4NU, 24 În DC, terminale cu șuruburi

CA4KN31BN3: Versiune cu terminal cu arc (replaces W3)

Codul HS vamal

HS code: 85364190 (Electromagnetic relays, rated voltage ≤60 V)

Înlocuitori comune

Alternative interne: Chint / Delicios 24 V DC control relays with 3NO+1NC contact configuration.

Schneider direct upgrade: other coil variants within the CA4KN series (de ex., 110 În DC).

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

Avantaje cheie: built-in bidirectional freewheeling diode, consum redus de energie a bobinei, direct PLC DO driving; 3NO+1NC allows 3 output channels plus 1 feedback channel; AC-15/DC-13 rated, frecventa maxima de functionare: 180 cycles per minute.

Caz 1: PLC Digital Output Port Expansion (Cele mai comune)

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

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

Contact assignment:

NO1: Drive LC1D contactor coil

NO2: Conduce 24 V DC solenoid valve

NO3: Run indicator lamp

NC1: Feedback to PLC DI for relay status monitoring (ruperea firului / contact sticking diagnosis)

Repere: 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.

Industrii: Masini-unelte, utilaje de ambalare, assembly line control cabinets.

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

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

Driving signal: Emergency stop circuit / 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.

Industrii: Conveying equipment, small lifting mechanisms, ventilator & pump control panels.

Caz 3: Ventilator & Damper Interlock Control for HVAC Air Handling Units

Scenariu: 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

Avantaje: High noise immunity with built-in diode, suitable for frequent switching in weak-current building control loops; gamă largă de temperatură de funcționare (-25 °C ~ +50 °C) for indoor plant rooms.

Industrii: Automatizarea clădirilor, clean air conditioning, fresh air handling units.

Caz 4: Primar & Standby Pump Rotation Control Relay

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

Logică: 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

Industrii: Sewage lifting, tratarea apei, water supply control panels.

Caz 5: Signal Expansion after Safety Relay Outputs

Scenariu: 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.

Industrii: Linii de producție automatizate, robot peripherals, cutting machinery.

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

Scenariu: 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 “Fugi” 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

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

Selecţie & Application Best Practices (Frequent Engineering Pitfalls)

1. Tip de încărcare: Only for control circuit loads (bobine de contactor, solenoizi, lămpi indicatoare); never for main power circuits. Rated thermal current: 10 O, 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. Terminale: 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. Montare: 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

Full model format: CAu KNvw + voltage code + terminal suffix

1. u = Coil Type

CA2KN: bobina AC (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 (numai 3 fixed configurations)

40: 4NU (4 Deschis normal)

31: 3NU+1NC (3 Deschide + 1 Închis, cele mai populare)

22: 2NU+2NC (2 Deschide + 2 Închis)

3. Cod de tensiune + Terminal Suffix (Key Part)

W3: Screw clamping terminals

N3: Terminale cu arc

Sufix “3” = built-in surge suppression diode

Contact Configurations (Numai 3 Options for the Whole Series)

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

Lista completă a modelelor: CA4KN Low-Consumption DC Coil (PLC Version, Built-in Diode)

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

1) 24 În DC (Most Popular: BW3 / BN3)

2) 48 În DC (EW3 / EN3)

CA4KN40EW3 / CA4KN40EN3

CA4KN31EW3 / CA4KN31EN3

CA4KN22EW3 / CA4KN22EN3

3) 72 În 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 (Şurub: BD/ED/FD…; Primăvară: BD3/ED3…)

12 În DC: JD / JD3

24 În DC: BD / BD3 (Top replacement: CA3KN31BD3 for CA4KN31BW3)

48 În DC: ED / ED3

110 În DC: FD / FD3

125 În DC: GD / GD3

220 În DC: MD / MD3

Full Model Examples (3 Contact Types)

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

CA3KN40BD3 (4NU)

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

CA3KN22BD3 (2NU+2NC)

2. Terminale cu arc: keep the voltage code unchanged, only adjust terminal suffix; de ex., CA3KN31BD3 (şurub) and spring-cage variant share the same voltage code.

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

Common Voltage Codes

24 V și: B7

48 V și: E7

110 V și: F7

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

380 V și: Î7

Full Contact Models (Bobina AC)

4NU: CA2KN40B7 / CA2KN40P7

3NU+1NC: CA2KN31B7 / CA2KN31P7

2NU+2NC: CA2KN22B7 / CA2KN22P7

Diferențierea terminalului (W3/N3 vs Non-Suffix “3”)

1. W3 = Screw clamping terminals (CA4KN31BW3)
2. N3 = Spring-cage quick connect terminals (înlocuire: 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)

Model original: CA4KN31BW3 (24 V DC low-consumption, 3NU+1NC, terminale cu șuruburi)

✅ Direct drop-in replacement: CA3KN31BD3 (24 Bobina standard V DC + diodă încorporată, 3NU+1NC, terminale cu șuruburi; amprentă identică, plug-and-play interchange)

General Technical Specifications (Uniform for All TeSys K Control Relays)

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

Curent termic convențional: 10 O (la 50 °C)

Tensiunea nominală de izolație: 690 V

Montare: DIN35 rail or base plate fixing

Overall width: 45 mm, same form factor as LC1K contactors for side-by-side mounting

Rezistenta mecanica: 20 milioane de operațiuni