Description
1494H-DN3H6 Allen‑Bradley Safety disconnect switch
Product Dimensions：
Product Detailed Description
The Allen-Bradley 1494H-DN3H6 is a heavy-duty safety disconnect switch from Rockwell Automation’s Bulletin 1494H Industrial series. It is designed for industrial and heavy commercial applications, providing reliable motor circuit protection and disconnection. This fusible model features visible-blade construction for clear ON/OFF indication, a side-mounted lockable metal handle that accepts up to three padlocks in the OFF position, and a Type 3R rain-proof painted metal enclosure. It accommodates Class H fuses and is suitable for 3-phase, 3-pole configurations, ensuring safe isolation of electrical loads. The switch complies with NFPA 79 standards, with the handle always mechanically linked to the switch mechanism for enhanced safety.
Product Parameters
The following table summarizes the key technical specifications for the 1494H-DN3H6:
| Parameter | Value/Details |
|---|---|
| Amperage | 60 A continuous current |
| Voltage Rating | 600 V AC (fusible); supports 240 V AC, 125 V DC, 250 V DC |
| Poles/Wires | 3-pole, 3-wire (3-phase) |
| Enclosure Type | NEMA Type 3R (rain-proof painted metal) |
| Fuse Type | Fusible with Class H fuses (600 V rating) |
| Dimensions (H x W x D) | 22-3/16 in. x 9-3/8 in. x 5 in. (563.56 mm x 238.13 mm x 127 mm); Width with handle: 10-3/64 in. (255.19 mm) |
| Horsepower Rating (UL/CSA) | 15 HP at 600 V AC (3-phase, 60 Hz); 15 HP at 480 V AC; 30 HP at 240 V AC; 10 HP at 250 V DC |
| IEC kW Rating (AC23) | 11 kW at 440 V/50 Hz; 22 kW at 220 V/50 Hz |
| Short-Circuit Withstand | 10,000 A unfused; 10,000 A with Class H fuses; 200,000 A with Class J or R fuses (30-100 A sizes) |
| Certifications | UL Listed (File E227497, Guide WIAX); CSA Certified (File LR1234, CSA C22.2 No. 4); RoHS compliant |
| Ambient Temperature | Operating: -35…+40 °C (-31…+104 °F); Storage: -40…+65 °C (-40…+149 °F) |
| Altitude | Up to 2000 m |
| Relative Humidity | 90% at +20 °C (+68 °F); 50% at +40 °C (+104 °F) |
| Dielectric Strength | 2200 V for 1 minute |
| Mechanical Life | 10,000 operations |
| Switching Frequency | Maximum 300 operations/hour |
| Conductor Size | #12…2 AWG (Al) or #14…10 AWG (Cu); pairs must match in type, strand, and size |
| Torque Ratings | Conductor to lug: 35…45 lb•in (3.95…4.08 N•m); Lug to terminal: 40…60 lb•in (4.5…6.8 N•m) |
| Wire Temperature Rating | 75 °C (167 °F) or higher |
Product Advantages
- Enhanced Safety: Visible blade design provides clear verification of disconnection status, reducing risk during maintenance. The handle locks in the OFF position with up to three padlocks, supporting lockout/tagout (LOTO) procedures per OSHA and NFPA 79.
- Durability and Reliability: Heavy-duty construction withstands harsh industrial environments, with a mechanical life of 10,000 operations and high short-circuit ratings (up to 200 kA AIC with proper fusing).
- Versatility: Accommodates Class H, J, and R fuses for flexible overcurrent protection; side-mounted handle allows easy access in tight spaces.
- Compliance and Efficiency: Meets UL, CSA, and RoHS standards for global use; compact enclosure saves panel space while providing robust protection.
- Cost-Effective Maintenance: Quick fuse replacement and optional accessories (e.g., neutral kits, interlocks) minimize downtime.
Precautions and Notes
- Installation Precautions: Mount in a vertical plane only. Use wires rated 75 °C (167 °F) or higher, sized per local electrical codes (e.g., NEC). Ensure consistent conductor types (Al or Cu) for pairs. Apply recommended torque values to avoid loose connections or damage.
- Operational Warnings: Do not exceed the switch’s continuous current rating (60 A). Verify proper fuse sizing for short-circuit protection—Class H fuses provide 10 kA withstand, while J/R offer up to 200 kA. The handle must always be linked to the switch; tampering voids compliance.
- Environmental Notes: Suitable for outdoor use (Type 3R), but protect from corrosive atmospheres. Operating temperature range is -35…+40 °C; derate above 40 °C. For four-wire applications, add a neutral kit (e.g., Cat. No. 599-NK4).
- Maintenance: Inspect for wear annually; replace fuses promptly after faults. Grounding is required—use optional ground lugs if needed.
- General Warning: This device is for disconnection only; not intended for frequent switching. Consult local codes and a qualified electrician for installation.
Product Applications
The 1494H-DN3H6 is ideal for industrial and heavy commercial settings requiring safe electrical isolation, such as:
- Motor Control Centers: As an “at-motor” disconnect for pumps, fans, conveyors, and compressors up to 15 HP at 600 V.
- Machine Tools and Automation: Protecting circuits in manufacturing lines, robotics, and assembly equipment.
- HVAC and Process Control: Disconnecting loads in heating, ventilation, and industrial processing plants.
- Commercial Facilities: General-purpose switching in warehouses, data centers, and heavy-duty lighting/power distribution.
- Hazardous/Outdoor Environments: Rain-proof enclosure suits exposed installations, with visible blades ensuring compliance for LOTO in safety-critical operations. It supports both AC and DC applications where visible disconnection is mandated by codes like NEC Article 430.
Shipping Port: Xiamen, China
Payment: Bank of Chicago, Bank of Singapore
Express cooperation: fedex, DHL, UPS and your express account
Service: Professional Sales provides 24 hours /7 days online service
Please make an inquiry for more models：
| AB | 1746-OB16 |
| AB | 1746-OB16E |
| AB | 1746-OB32 |
| AB | 1746-OB32E |
| AB | 1746-OB8 |
| AB | 1746-OBP16 |
| AB | 1746-OG16 |
| AB | 1746-OV16 |
| AB | 1746-OV32 |
| AB | 1746-OW16 |
| AB | 1746-OW16/C |
| AB | 1746-OW16/C/D |
| AB | 1746-OW4 |
| AB | 1746-OW8 |
| AB | 1746-OX8 |
| AB | 1746-P1 |
| AB | 1746-P2 |
| AB | 1746-P2/C |
| AB | 1746-P3 |
| AB | 1746-P4 |
| AB | 1746-P5 |
| AB | 1746-P6 |
| AB | 1746-P7 |
| AB | 1746SC-NI8U |
| AB | 1746SC-OAP8I |
| AB | 1747-ACN15 |
| AB | 1747-ACNR15 |
| AB | 1747-ACNR15/A |
| AB | 1747-ASB |
| AB | 1747-ASB/A |
| AB | 1747-ASB1747-L511 |
| AB | 1747-BA |
| AB | 1747-BSN |
| AB | 1747-BSN1771-IFE |
| AB | 1747-CP3/A |
