AIRPAX™ brand products: engineered, built and sold by Sensata Technologies

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Notes

Drawings

MDS

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

MDS

	EXAMPLE: 270-8-B-R-T

1.	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.

2.	High-Low Temperature Operation: The Modular Distribution System shall operate in a range from -40°C to +85°C.

3.	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

4.	Insulation Resistance: Shall not be less than 100 megohms at 500 volts DC.

5.	Flammability: All Modular Distribution System parts have an U.L. 94 V-O flammability rating.

6.	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.

7.	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

8.	Auxiliary Switch Wire Rating: 200° C; 600 volts; UL recognized (UL 1199)

9.	Ampacity: Line bus @ 600 amps: 850 amps/sq inch Line bus @ 300 amps: 850 amps/sq inch Load bus @ 100 amps: 1140 amps/sq inch

10.	Plating: 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.

11.	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.