Wieland SNA-4053-K-A 안전 릴레이

SNA: Safety switch monitoring series (for monitoring emergency stop, 안전문, 안전 라이트 커튼)

4053: 사양코드

케이: Pluggable screw terminals

에이: Supply voltage AC/DC 24 다섯

Suffix differentiation for the series:

A = AC/DC 24 다섯; C = Push-in spring terminals; KM = Automatic reset; KE = Special version

2. 핵심사양 & 안전 등급
3. 안전 인증

PL 전자 / 범주 4 (ISO에서 13849-1)

실 CL3 (안에 62061)

2. 연락처 구성

3 safety normally open contacts (13-14 / 23-24 / 33-34)

1 normally closed signal contact (41-42)

3. 전기 데이터

공급: 24 V AC/DC

Continuous rated current Ith: 8 에이

AC-15: 230 다섯 / 5 에이; DC-13: 24 다섯 / 5 에이

설치: 에서 35 mm 레일; 너비 22.5 mm

4. Input Functions

Dual-channel safety circuit (S11/S12, S21/S22)

Supports cross-channel short-circuit monitoring

수동 재설정 (with reset monitoring)

적합: 비상 정지 버튼, safety gate switches, magnetic safety switches, 안전 라이트 커튼

3. 일반적인 배선 논리
4. A1(+), A2(-): 24 V 전원
5. S11-S12, S21-S22: Dual-channel safety devices (normally closed signal)
6. S33-S34: Reset terminals (connect external normally open reset button; shorted = automatic reset)
7. 13-14 / 23-24 / 33-34: Safety outputs (for controlling main contactors)
8. 41-42: Normally closed fault feedback signal
9. Model Correction & 대체 참조

⚠️ The most frequently confused model on the market: SNA4043K-A (4043, easily mistaken for 4053)

⚠️ Important Verification Conclusion

SNA4053K-A is NOT an official standard model in Wieland catalogues, it is highly likely a transcription error:

1. Most common miswriting: SNA4043K-A (부품 번호. R1.188.1810.0)

자동 재설정, no reset monitoring; dual-channel with short-circuit monitoring

2. Alternative similar model: SNA4063K-A

수동 재설정 (with reset monitoring) — this is the core difference from SNA4043

Model rules:

SNA4043K-A: 자동 재설정

SNA4063K-A: 수동 재설정 (reset button monitoring)

Both models share identical contact configuration, safety rating and dimensions; only reset logic differs.

Quick Selection Comparison Table

권장 조치

1. Verify the printed model on the physical nameplate of the unit;
2. Confirm site requirements: Reset monitoring required or not

Emergency stop circuits generally require manual reset (SNA4063K-A)

Safety light curtain applications may adopt automatic reset (SNA4043K-A)

Application Scenarios of Wieland SNA Series 안전 릴레이 (SNA4043 / SNA4063)

This series achieves PL e / 카테고리 4 / SIL3 with dual-channel monitoring, primarily deployed for safety circuits on machine tools and automated production lines. Content is divided into supported safety signal types, industry applications, and key selection differentiation.

1. Supported Safety Input Signals (Hardware Utilization)
2. 비상 정지 버튼 (dual normally closed contacts)

Most common application: Machine main emergency stop and zone emergency stop circuits.

Standard requirement: Emergency stop circuits prefer SNA4063K-A (manual reset with monitoring).

2. Safety gate switches / Magnetic safety sensors

Interlock for protective doors, maintenance doors and perimeter fencing; power circuit cutout upon door opening.

3. Safety light curtains

Hazard zone intrusion protection for presses, conveyor lines and robot stations.

Light curtain solutions commonly use SNA4043K-A (자동 재설정).

4. Two-hand control devices

For stamping and riveting equipment, preventing single-hand access to hazardous zones.

5. Safety mats, safety bumpers

Perimeter intrusion detection around robot cells, automatic doors and lifting platforms.

2. Major Industry & Equipment Applications

(1) 공작기계 산업

CNC 선반, machining centres, 그라인더, 펀칭 기계, 벤딩 머신

애플리케이션: Protective door interlock, 비상 정지 회로, safety light curtain protection

(2) Automated Production & 포장 장비

포장 기계, 팔레타이저, 컨베이어 라인, 분류 장비, 라벨러

Robot workstations, gantry robot safety fence interlock

(3) 고무 & Plastics Industry

Injection moulding machines, 압출기, blow moulding equipment: Safety gates, 비상 정지, 안전 라이트 커튼

(4) 기호 논리학 & 창고 장비

Automated warehouses, lifts, shuttles, 라인 정렬

Lifting platforms, dock leveller safety interlocks

(5) 새로운 에너지 & Lithium Battery Equipment

Cell assembly machines, electrolyte filling machines, sealing equipment, test tooling

Wieland products are widely adopted on export machinery to meet EU CE Machinery Directive requirements

(6) 목공 & 인쇄 기계

Panel saws, 절단기, printing presses, die-cutting machine safety protection

(7) General Custom Automation

Custom test fixtures and assembly machines; deployed as core safety logic unit to cut off main contactors and servo power circuits.

3. Critical Application Selection Comparison

⚠️ SNA-4053-K-A is not an official Wieland standard model. It is almost certainly a nameplate transcription error; physical unit will be one of the two above variants.

4. 제한사항 & 부적합한 용도
5. Cannot directly drive high-power loads; safety contacts are intended to control contactor coils, not motors directly
6. Not suitable for solenoid valves or high-frequency switching loads
7. Cannot satisfy safety requirements higher than PL e / 카테고리 4 (this series already reaches Cat.4 maximum rating)

Selection Guidelines for Wieland SNA / SNO Safety Relays

Based on the SNA4043 / SNA4063 platform covered above; structured criteria ready for engineering proposals and procurement checks.

단계 1: Confirm Required Safety Rating (Mandatory Priority)

ISO 준수 13849-1 / 안에 62061

1. PL & 범주

PL 전자 / 카테고리 4: Highest rating. For high-risk stations including robots, stamping, injection moulding, machine tools and lithium battery equipment (supported by all mainstream SNA variants)

PL d / 카테고리 3: Low-risk general automation and conveyor lines

2. SIL 레벨

실 3 corresponds to PL e; preferred for machinery exported to EU

✅ Selection Rule: Do NOT downgrade safety rating for high-risk equipment.

단계 2: Determine Safety Input Channel Configuration (Dual Channel Is Standard)

Channel Modes

Dual-channel monitoring with cross short-circuit detection: 업계 표준, fitted across all SNA variants. Compatible with dual normally closed safety devices (비상 정지, 안전문, 라이트 커튼)

Single channel: Only permitted for low-risk scenarios; available on selected SNO variants. NOT allowed for high-risk machinery.

Compatible Sensor Types

Emergency stop switches, mechanical safety gates: Dual normally closed (NC)

Magnetic safety switches, 안전 라이트 커튼: 듀얼 NC / OSSD signals

⚠️ Two types of safety light curtains:

① OSSD solid-state output → Requires relay model supporting OSSD input

② Light curtain with relay converted contact output → Compatible with standard SNA4043 / SNA4063

단계 3: 재설정 모드 (Most Common Source of Wrong Selection!)

Key Distinction:

Monitored reset detects open or short circuits on reset wiring and triggers safety lockout for superior safety. Simple unmonitored manual reset should be avoided on new projects.

단계 4: 공급 전압

Main Wieland options:

Suffix A = AC/DC 24 다섯 (Automation standard, selected in 90% of projects)

Less common: 110 VAC, 230 VAC — only for legacy retrofits

예: SNA4063K-A → A = AC/DC 24 V 공급

단계 5: 터미널 유형 (Identified by Suffix K / 기음)

K = Pluggable screw terminals

장점: 진동 방지, ideal for permanent cabinet installation and on-site maintenance (the unit in your photo uses K terminals)

C = Push-in spring terminals

장점: Fast wiring without screwdrivers; use cautiously under heavy vibration

예: SNA4063K-A

단계 6: Output Contact Configuration

Main Safety Outputs (For Power Circuit Cutoff)

SNA4043 / SNA4063: 3 상시 개방형 안전 접점

목적: Wired in series with main contactor coils for redundant shutdown

Auxiliary Signal Contacts (PLC Feedback)

1 built-in normally closed fault contact

Opens upon safety activation or relay fault; used for alarm indicators and PLC signalling

선택 참고사항: If multiple feedback signals are required, add auxiliary relays. Safety contacts should not be expanded externally.

Contact Load Ratings

AC-15: 230 다섯 / 5 에이

DC-13: 24 다섯 / 5 에이

👉 Never drive motors directly; only control contactor coils!

단계 7: 설치 & 물리적 사양

1. 설치: Standard DIN 35 mm 레일
2. 너비: SNA40xx series 22.5 mm, compact design saving cabinet space
3. 환경 등급: IP20 (for cabinet installation only; not for outdoor direct deployment)

단계 8: Differentiate SNA vs SNO Series (Frequent Confusion)

SNA Series: Dual-channel safety monitoring, up to PL e Cat.4; for emergency stop, 안전문, 라이트 커튼 (your target series)

SNO Series: Predominantly single channel, lower safety rating generally PL d and below; low-cost basic solutions

Common Selection Pitfalls Checklist

1. ❌ Misapplication: Using automatic reset SNA4043 for emergency stop circuits — violates machinery safety standards, fails third-party audit & CE 인증
2. ❌ Transcription error SNA-4053-K-A: No official model; physical unit is either SNA4043 or SNA4063
3. ❌ Direct drive of solenoid valves or high-power loads with safety contacts → contact burnout and loss of safety function
4. ❌ Mixing K screw terminals and C spring terminals, leading to mismatch on delivery
5. ❌ Ignoring reset monitoring requirements → machine fails acceptance testing

Rapid Selection Workflow (For Field Engineers)

1. Identify safety device: 비상 정지 / safety gate → select SNA4063xx-A (monitored manual reset); Light curtain / safety bumper → SNA4043xx-A (자동 재설정)
2. Confirm supply voltage: Default AC/DC24V suffix A
3. 터미널 유형 선택: Permanent cabinet installation → K screw terminal; high volume assembly for fast wiring → C spring terminal
4. Verify safety rating: High-risk equipment requires PL e / 카테고리 4 / SIL3
5. Confirm number of safety contacts sufficient for contactor control

Complete Official Model List of Wieland SNA40xx Safety Relays

Series Profile: safeRELAY SNA40xx dual-channel safety monitoring, PL 전자 / 카테고리 4 / SIL3, DIN 레일 장착;

⚠️ Important Notice: SNA-4053-K-A is NOT an official Wieland model, it is a transcription error. Official core variants are limited to 4043 / 4044 / 4063 / 4064;

업계 표준: Suffix A = AC/DC24 V (automation default). Specify A suffix for new orders.

1. 모델 명명 규칙

`SNA 40XX [단말기][다시 놓기]-[전압 접미사]`

1. SNA: Dual-channel safety monitoring base unit
2. 40더블 엑스:

4043: 3 안전 NO 접점, 자동 재설정 (no reset monitoring)

4044: 4 안전 NO 접점, 자동 재설정 (no reset monitoring)

4063: 3 안전 NO 접점, manual reset (with reset circuit monitoring)

4064: 4 안전 NO 접점, manual reset (with reset circuit monitoring)

Last digit 3 = 3 안전 NO 접점; Last digit 4 = 4 안전 NO 접점

3. Terminal Code

케이: Pluggable screw terminals (most widely used in projects)

기음: Pluggable Push-in spring terminals

4. Extended Reset Suffix (KM/KE)

KM: Simple manual reset without monitoring; rarely specified for new projects

5. 전압 접미사

에이: AC/DC 24 다섯 (automation standard)

접미사 없음: Fixed screw terminals (legacy models, 단계적으로 폐지)

2. Mainstream Models for Domestic Projects (24 V AC/DC)

SNA4043 Series | 자동 재설정, 3 Safety NO Contacts

SNA4044 Series | 자동 재설정, 4 Safety NO Contacts

SNA4063 Series | 수동 재설정 (모니터링됨), 3 Safety NO Contacts【Preferred for Complete Machinery】

SNA4064 Series | 수동 재설정 (모니터링됨), 4 Safety NO Contacts

3. Legacy Non-Standard Voltage Models (Only For Equipment Replacement, Not Recommended For New Projects)

Fixed non-pluggable screw terminals (no suffix A)

SNA4043K: AC42~48 V / AC115 V / AC230 V

SNA4063K: AC230 V

메모: All new domestic machinery shall adopt AC/DC24 V models with suffix -A

4. General Specifications Applicable to All Variants
5. 안전등급: PL 전자 / 카테고리 4, 실 3 (EN ISO13849-1, EN62061)
6. Contact Ratings: AC-15 230 V/5 A; DC-13 24 V/5 A
7. 설치: 에서 35 mm 레일; 너비 22.5 mm; IP20 (Cabinet installation only)
8. 특징: Dual-channel cross short-circuit monitoring, EDM external device monitoring support, 3 status LED indicators
9. 배선: Supports single-channel / dual-channel connection modes
10. Quick Selection Summary Table

6. Procurement Reminders
7. If customer submits model `SNA-4053-K-A` → Confirm transcription error immediately. Check physical nameplate; the actual unit is almost certainly SNA4063K-A.
8. Always include complete model + manufacturer part number in BOM to avoid delivery mismatch between K screw terminals and C spring terminals.
9. Do not interchange automatic reset SNA4043 and monitored manual reset SNA4063; incorrect selection will lead to failed safety acceptance.
10. Contact count selection: 3 contactors or less → SNA4063; ≥4 contactors requiring synchronous shutdown → select SNA4064.