Square D PAF361600DC1680 2000A Circuit Breaker
The Square D PAF361600DC1680 is a molded case circuit breaker (MCCB) from the PA family, with a frame size of 2000A. It is a 3-pole breaker rated for 600V AC, 50/60 Hz, and utilizes a thermal-magnetic trip unit. The breaker is designed for I‑line panelboard mounting and provides feeder and branch circuit protection in industrial and commercial distribution panels.
Electrical Ratings
Frame size: 2000A (PA36 frame).
Continuous current rating (Iu): 1600A (adjustable via trip unit).
Number of poles: 3.
Rated insulation voltage (Ui): 800V.
Rated impulse withstand voltage (Uimp): 8 kV.
Breaking capacity (Icu): 65 kA at 480V AC, 35 kA at 600V AC.
Trip Unit Characteristics
The breaker is equipped with a thermal-magnetic trip unit (type D, 1600A continuous). The thermal (overload) element is adjustable from 0.7 to 1.0 x In via a rotary dial. The magnetic (short-circuit) element has a fixed pickup of 10 x In (16,000A). The trip unit includes an ambient temperature compensation (rated for 40°C).
I‑line Mounting
The PAF361600DC1680 is designed for Square D I‑line panelboards and switchboards. It features integral mounting clips and jaw contacts for plug‑on connection to vertical bus bars. The breaker occupies three I‑line spaces (13.5 inches). It is suitable for use as a main or branch breaker in I‑line distribution equipment.
Mechanical Features
The breaker has a rugged molded case of glass-filled polyester (UL 94 V-0). It includes a visible trip indicator (red flag), a push‑to‑trip test button, and a padlockable handle (up to three padlocks in OFF position). Mechanical life: 4000 operations; electrical life: 1000 operations at rated load. The handle is standard toggle type with ON/OFF/Trip indication.
Connections
Line and load terminals are I‑line jaw connectors (rear) and bus bar straps (front). The breaker accepts aluminum or copper bus bars up to 2 x 3/8 inch thickness. Terminal torque: 250 in‑lb (28 Nm). An optional lug kit (PA36LUG) is available for wire connections (4 AWG–500 kcmil).
Accessories
Field‑installable accessories: shunt trip (PA36ST), undervoltage release (PA36UV), auxiliary contacts (1NO+1NC, PA36AX), alarm switch (PA36AL). All accessories mount on the left side of the breaker without special tools.
Environmental
Operating temperature: -25°C to +70°C (derate above 50°C: reduce current by 1.5% per °C). Storage: -40°C to +85°C. Humidity: 10% to 95% non-condensing. The breaker meets UL 489, CSA C22.2 No. 5.1, and NEMA AB-1. It is CE marked for export.
Dimensions and Weight
Height: 11.5 in (292 mm), Width: 7.5 in (191 mm), Depth: 5.2 in (132 mm). Weight: 15 lb (6.8 kg). The breaker is shipped with terminal covers and mounting hardware.
Typical Applications
Main disconnect for large HVAC equipment, lighting panels, industrial motor control centers, and service entrance equipment up to 1600A continuous.
Ordering Information
Square D catalog number: PAF361600DC1680. Manual: I‑line Circuit Breaker Instruction Bulletin (48049-420-01).
