Modular design provides unprecedented flexibility.
Unique alarm conductors simplify signal wiring.
Modular load terminals available with top or rear access.
"Hot Plug" modules allow for equipment expansion without power shutdown.
Compatible circuit breakers include the AIRPAX® IEL, IML, LEL, & LML Series circuit breakers with 5/16" diameter bullet style terminals
This specification covers AIRPAX® four and eight position Modular
Distribution Systems for LEL, LML, IEL, IML type circuit protectors using 5/16 inch diameter bullet terminals. Consult the factory for additional options for Number of Positions, Metric Threads, and Plating.
High-Low Temperature Operation:
The Modular Distribution
System shall operate in a range from -40°C to +85°C.
Dielectric Strength: The Modular Distribution System shall
withstand DC voltage for 60 seconds between all electrically
isolated parts as follows: Between line and load bus bars: Minimum 2000 VDC Between line and load bus bars and aux. switch contact strips: Minimum 2000 VDC Between line and load bus bars and clamp up rods: Minimum 2000 VDC
Shall not be less than 100 megohms at
500 volts DC.
All Modular Distribution System parts have
an U.L. 94 V-O flammability rating.
Electrical Ratings: Current Ratings:
Maximum load bus rating per position is 100 amps.
Maximum common bus rating of the eight position Modular
Distribution system is 600 amps.
Maximum common bus rating of the four position Modular
Distribution System is 300 amps. Voltage Rating: 125 VDC max.
Recommended Torque Specifications:
Load bus 1/4 - 20 UNC 72 inch pounds
Line bus 3/8 - 16 UNC 192 inch pounds
Mounting channel #10 x 0.750 long 20 inch pounds
Line bus @ 600 amps: 850 amps/sq inch
Line bus @ 300 amps: 850 amps/sq inch
Load bus @ 100 amps: 1140 amps/sq inch
Common and load bus bars are available with either
silver or tin plating. Silver Plating: The plating of the louvertec bands of the AIRPAX® circuit protectors used in the Modular distribution System are silver plated. Silver plated bus bars on the AIRPAX® Modular
Distribution System product significantly reduce the possibility of galvanic corrosion. Tin Plating: The use of tin plated bus bars with the silver plated
louvertec bands on the circuit protector increases the possibility of galvanic corrosion at the joint interface.
The use of a conductive polymer such as Stabilant 22 or CAIG
100 is recommended with both silver plated and tin plated bus bars in order to negate galvanic corrosion and to improve the
conductivity of the joint interface.
Beryllium Copper Contact Strip:
Beryllium copper strips are
used to conduct current to and from the terminals of the circuit
protector auxiliary switch. The beryllium copper strips have a
minimum compression set and will return to their original size
with as much as a 30% deflection. Repeated insertion and
removal of the circuit protector in this application will have an
insignificant effect on the contact force between the auxiliary
switch terminals and the beryllium copper strips.
MDS Images related to selected product options on Assemble tab.