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Allen-Bradley 440N‑G02143 Guardmaster Ferrogard GD2 Non‑Contact Safety Switch
This is a magnetically actuated non‑contact safety interlock switch from the Allen‑Bradley Guardmaster product line, featuring a GD2 high‑grade stainless steel housing, 24VDC control supply, 2 Normalmente chiuso (NC) safety contacts + 1 Normalmente aperto (NO) contatto ausiliario, and factory‑fitted 6‑metre cable. It is suitable for safety circuits up to Safety Category 1~4 and meets PLe per ISO 13849‑1.
- Spiegazione del codice modello
| Segmento di codice | Descrizione |
| 440N | Base identifier for Guardmaster non‑contact safety switches |
| ‑G | Codice della serie: Ferrogard GD2 (GD2 = heavy‑duty stainless steel housing, differentiated from standard plastic‑bodied Ferrogard 1/2/20/21 intervalli) |
| 2 | Codice di configurazione del contatto: 2NC safety +1NO auxiliary; (01=1NC+1NO, 03=3NC, ecc.) |
| 14 | Electrical rating code: 24VCC, max switching capacity 1A; (13=250VAC, 2A max switching capacity) |
| 3 | Cable length code: 6M; (2=3m, 4=10m, 9=M12 connector version) |
| Disponibilità | Active production, no end‑of‑life plan; standard 1‑year manufacturer warranty |
- Key Electrical & Specifiche meccaniche
| Parametro | Valore | Remark |
| Switch Type | Magnetic non‑contact with reed contacts | Zero mechanical wear, superior reliability |
| Contact Layout | 2NC (sicurezza) +1NO (ausiliario) | Positively driven safety contact design |
| Tensione nominale & Attuale | 24VCC, 1A max switching | Control circuit rating |
| AC‑15 rating: 250VAC 2A (alternate part numbers) | ||
| Categoria di sicurezza | Cat.1 (single unit), Cat.3/4 (two units series‑wired) | Compliant with ISO 13849‑1 for PLe |
| Functional Safety | SIL CL3, PFHD=3×10⁻⁷, MTTFD＞385 years | Conforme alla norma CEI 61508 / CEI 62061 |
| Protezione dall'ingresso | IP67 | Dust‑tight, impermeabile, washdown‑capable for food & industria delle bevande |
| Materiale dell'alloggiamento | 316 Stainless Steel | Resistente alla corrosione, impact resistant, FDA hygienic compliant |
| Operating Distance | Massimo. 18 mm | High mounting tolerance; reliable operation with ±5 mm misalignment |
| Temperatura operativa | ‑25℃ ~ +70℃ | Wide ambient range for harsh industrial environments |
| Resistenza meccanica | Over 2×10⁶ operations | Far longer service life vs conventional mechanical limit switches |
| Terminazione | 6m PVC‑sheathed cable | M12 pluggable variant available (440N‑G02149) |
| Certificazioni | CE, UL, CCC, CUL, KC, IECEx | Globally approved per industrial safety standards |
- Full GD2 Series Part Number List (440N‑G Ferrogard Family)
| Catalog No. | Contact Layout | Voltaggio / Attuale | Connessione | Alloggiamento | Applicazione tipica |
| 440N‑G02143 | 2NC+1NO | 24VDC /1A | 6m fixed cable | Stainless Steel | General standard industrial installation |
| 440N‑G02123 | 2NC+1NO | 24VDC /1A | 3m fixed cable | Stainless Steel | Short wiring distance |
| 440N‑G02137 | 2NC+1NO | 24VDC /1A | 10m fixed cable | Stainless Steel | Long wiring distance |
| 440N‑G02149 | 2NC+1NO | 24VDC /1A | 8‑pin M12 connector | Stainless Steel | Quick disconnect, frequent maintenance |
| 440N‑G02113 | 2NC | 250VAC /2A | 3m fixed cable | Stainless Steel | Circuiti di controllo CA |
| 440N‑G02119 | 2NC | 24VDC /1A | 3m fixed cable | Stainless Steel | Safety‑only feedback requirement |
| 440N‑G02118 | 1NC+1NO | 24VDC /1A | 3m fixed cable | Stainless Steel | Single safety + auxiliary signal |
| 440N‑G02090 | 1NC | 250VAC /2A | 6m fixed cable | Stainless Steel | Basic safety monitoring |
- Cross‑Reference & Alternative Selection Table
4.1 In‑Family Upgrade: Ferrogard → RFID SensaGuard
| Original PN | Upgrade PN | Upgrade Benefits | Applicazione |
| 440N‑G02143 | 440N‑Z21SS2HN | Anti‑tamper RFID coded actuator, higher safety rating | High‑hazard areas, prevent unauthorised bypass |
| 440N‑G02143 | 440N‑Z21SU2HN | Unique coded actuator, Cat.4 PLe certified | Automotive production, robot cells |
4.2 Cross‑Brand Direct Replacements
| Original PN | Produttore | Alternative Part | Compatibility Feature |
| 440N‑G02143 | Fungo | PSENmag 3.1p | Identical contact layout, IP67 |
| 440N‑G02143 | Schneider Electric | XCSDMP793 | Magnetic non‑contact, stainless steel housing |
| 440N‑G02143 | Omron | D4NS‑2AF | 2NC+1NO, 24VCC, IP67 |
| 440N‑G02143 | Siemens | 3SE5112‑0CD01 | Safety switch with equivalent specs |
- Ambienti applicativi & Casi di settore
✅ Recommended Applications
- Cibo & Bevanda: Guard door monitoring on filling & macchine per l'imballaggio; stainless construction resists corrosion, IP67 washdown compliant to FDA rules.
- Farmaceutico: Safety interlock for cleanroom equipment; non‑contact design eliminates abrasive dust generation from mechanical friction.
- Produzione automobilistica: Safety perimeter doors for robotic cells; generous mounting offset tolerances suit frequent door cycling.
- Trattamento delle acque: Interlock for pump compartment access doors; waterproof anti‑corrosion housing for damp environments.
- Macchine per l'imballaggio: Safety protection for heat sealers & labellers; contactless construction extends operational lifespan.
- Macchine utensili: Guard doors for CNC centres & stamping presses; positively opening safety contacts protect operator safety.
❌ Restricted / Forbidden Applications
- Strong Magnetic Field Zones: Close proximity to large electromagnets or heavy motors may cause false switching.
- High‑Temperature Locations: Ambient over 70℃ degrades magnetic element performance and contact service life.
- High‑Pressure Jet Washing: IP67 does not withstand direct >100bar high‑pressure spray cleaning.
- Mechanical Locking Requirement: No built‑in lock mechanism; select locked‑body 440G series for locked access applications.
- Explosion Hazard Areas: Non‑Ex rated; specify ATEX certified explosion‑proof safety switches.
Industry Application Summary
| Industria | Attrezzatura | Switch Function |
| Cibo & Bevanda | Dairy filling lines | Cuts power to filling valve & conveyor upon guard door opening to avoid contact with rotating machinery |
| Automobilistico | Robotic welding cells | Door interlock prevents robot startup during operator access; provides door status feedback signal |
| Pharma | Freeze dryer access hatch | Contactless design avoids particulate contamination; prevents hatch opening under vacuum condition |
| Trattamento delle acque | Sewage pump service pit | Waterproof stainless housing monitors hatch state to prevent fall‑in and electric shock hazards |
| Confezione | High‑speed labelling equipment | Long mechanical life handles frequent cycling; safety contacts halt labelling head immediately on door open |
- Common Fault Diagnosis & Remedies
| Fault Description | Root Cause | Corrective Action |
| Safety contacts fail to close | 1.Actuator misaligned or over maximum gap | 1.Reposition actuator within 18mm sensing range |
| 2.Demagnetised or damaged actuator | 2.Replace faulty actuator | |
| 3.Broken cable / connessione terminale scadente | 3.Inspect wiring or renew cable | |
| Spurious contact toggling | 1.External stray magnetic interference | 1.Relocate away from magnetic sources or add shielding |
| 2.Unstable supply voltage | 2.Stabilise power supply with filter component | |
| 3.Ossidazione da contatto / contamination | 3.Clean contacts or replace switch | |
| No signal from auxiliary contact | 1.Incorrect wiring termination | 1.Rewire per official wiring diagram |
| 2.Burned auxiliary contact | 2.Replace defective unit | |
| 3.Internal switch damage | 3.Arrange after‑sales professional repair | |
| Internal damage from water ingress | 1.Failed cable gland sealing | 1.Reseal or replace damaged cable fitting |
| 2.Incorrect installation compromising seals | 2.Follow installation manual to properly seat rubber gaskets | |
| Missing detached actuator | 1.Impact dislodgement | 1.Refit and mechanically secure actuator |
| 2.Insufficient fastening torque | 2.Use lock nuts plus optional protective cover |
- Quick Selection Mnemonic
440N‑G = GD2 stainless IP67 grade;
02 means 2NC+1NO, 14 stands for 24VDC;
2=3m,3=6m,4=10m,9=M12 plug trade;
Cibo & pharma pick stainless shell, upgrade SensaGuard for anti‑bypass grade;
Long life non‑contact build, certified up to PLe safety!
- HS Code & Conformità del trasporto aereo
HS Code: 85365000 (Electrical switching apparatus for circuit protection)
Air Shipment: Non‑hazardous goods; only mechanical reed and magnetic components inside, nessuna batteria al litio / supercapacitor, fully compliant with IATA DGR rules.
CE Compliance: Complies with Low Voltage Directive 2014/35/EU & Machinery Directive 2006/42/EC; Declaration of Conformity available on request.
