ASCO AUTOMATIC SWITCH CO. PULSAR 450120Y40 208Y 120V AC 3-PHASE WYE L-L

The ASCO PULSAR 450120Y40 is a high-performance, 40 Amp automatic transfer switch (ATS) engineered for seamless and reliable power transition between primary (Normal) and backup (Emergency) 3-phase AC power sources. Designed for critical applications in commercial, industrial, and institutional facilities, this switch ensures continuous uptime for essential loads like data centers, medical equipment, security systems, and life safety circuits during a utility power failure.

Core Specifications & Model Breakdown:

• Manufacturer: ASCO Automatic Switch Co. (Emerson)

• Series: PULSAR 450 (Compact, Economical Series)

• Model: 450120Y40

• Current Rating: 40 Amperes

• Voltage Configuration: 208Y/120V AC

  • 208V Line-to-Line (L-L)

  • 120V Line-to-Neutral (L-N)

• Phase & System: 3-Phase, 4-Wire Wye (3Ø4W)

• Operation: Automatic, Open Transition (Break-Before-Make)

• Enclosure: Typically supplied as open-type (for panel mounting), with optional NEMA-rated enclosures available.

Key Features & Benefits:

• Reliable Power Continuity: Automatically transfers connected loads to a standby generator within seconds of a utility outage, and retransfers back when normal power is restored.

• Compact & Economical Design: The PULSAR 450 series offers the proven reliability of ASCO in a cost-effective, space-saving footprint, ideal for smaller to mid-sized critical loads.

• Rugged Power Switching Mechanism: Features a robust, quick-make, quick-break contactor design for high electrical endurance and dependable performance under load.

• Integrated Microprocessor Controller: Monitors both power sources continuously for parameters like voltage and frequency, ensuring safe, controlled transfers based on user-adjustable setpoints.

• Safety & Compliance: Engineered to meet or exceed UL 1008 standards for automatic transfer switches. Open transition design ensures sources are never paralleled, protecting personnel and equipment.

• Easy Installation & Service: Straightforward wiring and user-accessible controls simplify setup and maintenance.

Typical Applications:

• Small to Medium Commercial Buildings

• Retail Banking & Branch Offices

• Telecom & Network Closets

• Medical & Dental Offices

• Water/Wastewater Control Panels

• Security & Fire Alarm Systems

• Pump and Fan Motor Loads

Why Choose This ASCO ATS?

When you specify the ASCO PULSAR 450120Y40, you are selecting a product backed by over 130 years of ASCO innovation and leadership in power transfer technology. It delivers mission-critical reliability, engineered safety, and simplified operation in a value-oriented package, ensuring your essential systems never go dark.