Allen-Bradley 440R-N23114 Safety Relay

Basic Model Definition

Catalog Number: 440R-N23114

Internal Model Code: MSR126.1T

Marca: Allen-Bradley (Rockwell Automazione), Guardmaster Minotaur Series

Ciclo vitale: Active production model, manufactured in Czech Republic, standard 1-year warranty

2. Core Electrical Specifications

2.1 Alimentazione elettrica

Tensione nominale: 24V CA/CC, raggio d'azione: 0.85~1.1× rated voltage (20.4~26,4 V)

Consumo energetico: 4W, compatibile con 50/60Hz

Terminals A1/A2: Power input

2.2 Safety Inputs (Dual-channel 4-wire with cross short-circuit detection)

2 normalmente chiuso (NC) safety input paths (S11-S12 / S21-S22)

Supports dual-channel emergency stop, safety door switches and safety light curtains; built-in cross-channel short-circuit fault diagnosis

Maximum input loop resistance: ≤90Ω

2.3 Reset Circuit (S33-S34)

MSR126.1T supports automatic reset and manual reset dual modes

1. Ripristino automatico: Short S33 and S34; outputs close automatically after faults are cleared
2. Ripristino manuale: Connect an external normally open reset pushbutton to S33-S34; manual push is required to restore outputs

Difference from MSR126.1R: MSR126.1R only provides monitored manual reset without automatic reset function

2.4 Safety Output Contacts (Force-guided safety contacts complying with IEC 61810-3)

2 safety normally open (NO) contatti: 13-14, 23-24

Load Ratings:

DC-13: 6A/24V DC; 3A/24V DC (for frequent switching)

AC-15: 5A/250 V CA

Tempo di risposta: ca. 15SM; Recovery Time: 100SM

No auxiliary alarm contacts

3. Safety Certification Ratings (Top Industry Standards)

ISO 13849-1: Categoria 4 / PL e

CEI 61508 / CEI 61511: SIL 3

IN 954-1: Categoria di sicurezza 4, Categoria 0 Fermare

Certificazioni: CE, cULus, CCC, BG, C-Tick

4. Mechanical Dimensions & Montaggio

Larghezza: 22.5mm (compact DIN rail mounting)

Dimensione complessiva: 110mm (H) ×75 mm (D) × 22.5mm (W)

Peso: 160G

Terminali: Fixed screw terminals (non-pluggable), Grado di protezione IP20

Temperatura operativa: -25℃ ~ +70 ℃

5. Front Panel LED Indicator Meanings
6. PWR (Verde): Steady on when power supply is normal
7. CH1 (Verde): Illuminated when Channel 1 input circuit is closed
8. CH2 (Verde): Illuminated when Channel 2 input circuit is closed

All three LEDs on → Safety output contacts closed; Any single channel open → Outputs cut off

6. Scenari applicativi tipici
7. Dual-channel emergency stop button circuit monitoring
8. 4-wire safety door switches (with short-circuit detection)
9. Safety light curtain / light screen safety circuits
10. Safety cut-off for machine tools, automated production lines and packaging equipment

Suitable for equipment requiring high safety ratings of PL e / SIL3

7. Series Model Comparison for Selection

8. Brief Wiring Logic
9. Connect 24V AC/DC power to terminals A1/A2
10. Wire two NC safety switches (arresto di emergenza / interruttori delle porte) in series to S11-S12 and S21-S22 respectively
11. Short-circuit S33-S34 for automatic reset; connect an NO pushbutton in series for manual reset
12. Wire the safety coil of main contactors in series across terminals 13-14 E 23-24
13. Disconnection of any safety input or cross-channel short-circuit will simultaneously open both NO outputs to cut power supply
14. Troubleshooting Guidelines
15. LED PWR spento: Power phase loss, insufficient voltage or loose wiring
16. Single CH1/CH2 LED off: Corresponding channel switch open or circuit wire breakage
17. Both CH1 and CH2 LEDs lit but outputs fail to close: Cross-channel short-circuit fault; power cycle to reset, or reset circuit not shorted / reset button not pressed
18. Saldatura dei contatti: Excessive output load; replace contactors with higher capacity

Full Specifications of Safety Output Contacts for Allen-Bradley 440R-N23114

1. Basic Contact Structure
2. Quantità & Tipo: 2 independent redundant safety normally open (NO) contacts at terminals 13-14 E 23-24; no auxiliary alarm contacts or delayed outputs
3. Contact Construction: Force-guided safety contacts (CEI 61810-3), dual-channel redundant mechanical interlock. Single contact welding cannot maintain circuit conduction, fulfilling Category 4 / PL e / SIL3 safety architecture
4. Materiale di contatto: AgSnO₂ silver tin oxide, resistente all'arco elettrico e antisaldatura
5. Minimum Conducting Current: 10mA (ensures reliable circuit detection by contacts)
6. Rated Load Currents (Official Standard Load Categories)

2.1 AC Load (AC-15, standard load for electromagnetic contactors)

250V e: 6UN (inductive-resistive load, cosφ=0.35)

UL B300 certified rating: 5UN / 250V e

2.2 DC Load (DC-13, elettrovalvole / Bobine CC)

Frequent switching at 24V DC: 3UN (standard switching rating)

Low-frequency light load (0.1Hz) at 24V DC: Massimo. 6A for short-term use (long-term high-frequency operation not recommended)

2.3 Continuous Thermal Current Ith (static carrying current without switching)

Maximum static continuous current per single contact: 6UN (only for permanent conduction with rare break operations)

3. Resistenza elettrica & Operating Timing
4. Resistenza elettrica (220V e / 4UN / cosφ=0.35)

6A breaking capacity: 100,000 operazioni

4A light load: 500,000 operazioni

2. Safety Operation Timing

Response time from safety input open to contact break: ≤15ms

Contact pull-in recovery time after fault clearance: ca. 100SM

3. Dielectric Withstand Voltage

Withstand voltage across open contacts: AC750V for 1 minuto

Resistenza di isolamento (DC500V test): ≥1000MΩ

4. External Protection & Wiring Limitations
5. Recommended Fuse for Output Circuit

Slow-blow fuse: 6UN; Fast-acting fuse: 10UN. Over-rated fuses are prohibited to prevent contact ablation and welding

2. Applicable Wire Gauge: 0.2~2.5mm² solid / stranded copper wires; fixed non-pluggable screw terminals
3. Maximum Operating Voltage: 250V e / 30A DC; overvoltage is strictly forbidden
4. Contact Performance Matching Safety Ratings

ISO 13849-1: Categoria 4, PL e (independent cut-off via dual redundant contacts)

CEI 61508: SIL3; single contact failure will not disable safety cut-off function

Stop Category: IN 60204-1 Categoria 0 hard cut-off stop

6. Quick Load Selection Table

tic Continuous | ≤250VAC / 30VCC | 6UN | Circuits with permanent conduction and minimal breaking operations |