Schneider CA4KN31BW3 Control Relay

CA4KN: TeSys K series control relay

31: 연락처 구성: 3 아니요 + 1 NC

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

W3: Screw clamping terminals

핵심 기술 매개변수

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

접촉 배열: 3 평상시 열림 + 1 평상시 닫힘 (3아니요+1NC), 4-폴

기존열전류 Ith: 10 에이 (~에 50 ℃)

정격절연전압 Ui: 690 다섯

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

설치: DIN35 rail mounting or base plate fixing

배선: 나사 터미널, 조임 토크 1.3 N·m

치수: W45 mm × H58 mm × D57 mm

기계적 내구성: 20 백만 개의 작업

Recommended protection: 10 A gG fuse

기원: 인도네시아 공화국

일반적인 응용 분야

PLC digital output expansion, signal isolation & 옮기다, 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 & 선택

CA4KN22BW3: 2아니요+2NC, 24 DC에서, 나사 터미널

CA4KN40BW3: 4아니요, 24 DC에서, 나사 터미널

CA4KN31BN3: Spring-cage terminal version (replaces W3)

세관 HS 코드

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

Common Replacements

국내 대안: 친트 / 맛있는 24 V DC control relays with 3NO+1NC contact configuration.

슈나이더 direct upgrade: other coil variants within the CA4KN series (예를 들어, 110 DC에서).

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

주요 장점: built-in bidirectional freewheeling diode, 낮은 코일 전력 소비, direct PLC DO driving; 3NO+1NC allows 3 output channels plus 1 feedback channel; AC-15/DC-13 rated, max operating frequency: 180 cycles per minute.

사례 1: PLC Digital Output Port Expansion (가장 일반적인)

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

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

Contact assignment:

NO1: Drive LC1D contactor coil

NO2: 운전하다 24 V DC solenoid valve

NO3: Run indicator lamp

NC1: Feedback to PLC DI for relay status monitoring (단선 / 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.

산업: 공작기계, 포장 기계, assembly line control cabinets.

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

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

Driving signal: 비상 정지 회로 / 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)

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

산업: 운반 장비, small lifting mechanisms, 팬 & pump control panels.

사례 3: 팬 & Damper Interlock Control for HVAC Air Handling Units

대본: 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

장점: High noise immunity with built-in diode, suitable for frequent switching in weak-current building control loops; 넓은 작동 온도 범위 (-25 ℃ ~ +50 ℃) for indoor plant rooms.

산업: 빌딩 자동화, clean air conditioning, fresh air handling units.

사례 4: 주요한 & Standby Pump Rotation Control Relay

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

논리: 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

산업: Sewage lifting, 수처리, water supply control panels.

사례 5: Signal Expansion after Safety Relay Outputs

대본: 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.

산업: 자동화된 생산 라인, robot peripherals, cutting machinery.

사례 6: Isolated Passive Signal Transfer for Variable Frequency Drives / 소프트 스타터

대본: 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 “달리다” 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

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

선택 & Application Best Practices (Frequent Engineering Pitfalls)

1. 부하 유형: Only for control circuit loads (접촉기 코일, 솔레노이드, 표시 등); never for main power circuits. Rated thermal current: 10 에이, 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. 터미널: W3 = screw terminals; spring-cage alternative: CA4KN31BN3.
4. Contact logic for 3NO+1NC: 3 출력 채널 + 1 feedback channel, the most widely used contact allocation for automation panels.
5. 설치: 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

전체 모델 형식: CAu KNvw + voltage code + terminal suffix

1. u = Coil Type

CA2KN: AC 코일 (50/60 헤르츠)

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 (오직 3 fixed configurations)

40: 4아니요 (4 평상시 열림)

31: 3아니요+1NC (3 열려 있는 + 1 닫은, 가장 인기있는)

22: 2아니요+2NC (2 열려 있는 + 2 닫은)

3. 전압 코드 + Terminal Suffix (Key Part)

W3: Screw clamping terminals

N3: Spring-cage terminals

접미사 “3” = built-in surge suppression diode

접점 구성 (오직 3 Options for the Whole Series)

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

전체 모델 목록: CA4KN Low-Consumption DC Coil (PLC Version, Built-in Diode)

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

1) 24 DC에서 (가장 인기있는: BW3 / BN3)

2) 48 DC에서 (EW3 / EN3)

CA4KN40EW3 / CA4KN40EN3

CA4KN31EW3 / CA4KN31EN3

CA4KN22EW3 / CA4KN22EN3

3) 72 DC에서 (SW3 / SN3)

CA4KN40SW3 / CA4KN40SN3

CA4KN31SW3 / CA4KN31SN3

CA4KN22SW3 / CA4KN22SN3

메모: 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 (나사: BD/ED/FD…; 봄: BD3/ED3…)

12 DC에서: JD / JD3

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

48 DC에서: 에드 / ED3

110 DC에서: FD / FD3

125 DC에서: GD / GD3

220 DC에서: MD / MD3

Full Model Examples (3 Contact Types)

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

CA3KN40BD3 (4아니요)

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

CA3KN22BD3 (2아니요+2NC)

2. Spring-cage terminals: keep the voltage code unchanged, only adjust terminal suffix; 예를 들어, CA3KN31BD3 (나사) and spring-cage variant share the same voltage code.

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

Common Voltage Codes

24 뷔와: B7

48 뷔와: E7

110 뷔와: F7

220/230 뷔와: M7 / P7 (most used: CA2KN31P7)

380 뷔와: Q7

Full Contact Models (AC 코일)

4아니요: CA2KN40B7 / CA2KN40P7

3아니요+1NC: CA2KN31B7 / CA2KN31P7

2아니요+2NC: CA2KN22B7 / CA2KN22P7

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

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

원래 모델: CA4KN31BW3 (24 V DC low-consumption, 3아니요+1NC, 나사 터미널)

✅ Direct drop-in replacement: CA3KN31BD3 (24 V DC 표준 코일 + 내장 다이오드, 3아니요+1NC, 나사 터미널; identical footprint, plug-and-play interchange)

일반 기술 사양 (Uniform for All TeSys K Control Relays)

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

기존 열 전류: 10 에이 (~에 50 ℃)

정격 절연 전압: 690 다섯

설치: DIN35 rail or base plate fixing

전체 폭: 45 mm, same form factor as LC1K contactors for side-by-side mounting

기계적 내구성: 20 백만 개의 작업