Clipsal MAX4 Mini Neutral link 100 A 500 V 10 hole with cover Black

Issue:
Product Line:
Limit Switches

Environment:
Type L100

Cause:
The need to know if another part is needed.

Resolution:
It will require a hub R6

Issue:
What does UL accept as conditions for supplementary protectors?

Product Line:
UL1077 Supplementary Protectors

Resolution:
UL 1077 circuit breaker, File No. E90509, CSA C22.2 No. 235 File No. 179014

CONDITIONS OF ACCEPTABILITY (NOT FOR UL REPRESENTATIVE USE):
Use - For use only in products where the acceptability of the combination is determined by Underwriters Laboratories Inc.

1.These devices are intended to be DIN rail mounted or faceplate mounted with front mounting bracket accessory. Additionally, they should be mounted in an enclosure having adequate strength and thicknesses in the intended manner and with spacing in accordance with the requirements of the overall equipment.

2.  Intentionally left blank.

3.These devices should be used within their Recognized ratings.

4.Test records should be reviewed, including short circuit tests, when judging the acceptability of these devices in an end use application.

5.These devices are not suitable for branch circuit protection.

6.These devices are designed to trip within the trip curve characteristics provided by the manufacturer; as indicated in the report.  Trip times were confirmed at 300% of rating and at 150% of rating.

7.Considerations should be given to the need for insulating barriers when uncovered openings in the side of the case are mounted adjacent to metal surfaces, such as an enclosure.

8.These devices have been determined to be trip free per
requirements effective July 14, 2008, 6th Edition of UL 1077.

9.The terminals are suitable for Field or Factory wiring.

Issue:
Can Multi-9 C60 breakers be continuously loaded to 100% of their rating?

Product Line:
Multi 9 C60 MCB's

Resolution:
UL 489 Listed Multi 9 C60 circuit breakers may be loaded to no more than 80% if used with continuous loads.
UL 1077 recognized supplementary protectors may be operated at 100% of their rating.
IEC 60947-2 C60 breakers may be operated at 100% of their rating.

Issue:  
What do the B curve, C curve, D curve, K curve and Z curve designations mean on Multi 9 breakers?

Product Line:
Circuit Breakers

Resolution:
For C60 Multi-9 devices, AC rated, the following is the meaning of the trip curves (in reference to instantaneous trip rating):
B curve: 3.2 - 4.8 times amp rating for UL489 and UL1077 (3 - 5 times amp rating for IEC)
C curve: 7 - 10 times amp rating
D curve: 10 - 14 times amp rating
K curve: 10 - 14 times amp rating
Z curve: 2.4 to 3.6 times amp rating
Trip curves are included in the 0860CT0201 catalog.

You can use a "Voltage Independent" earth leakage protection device (3P or 4P) on balanced two phases network in opposition (phases are offset by 180 degree) of single-wire earth return (SWER) system.

As the earth leakage current detection is based on a magnetic toroid surrounded by all the active conductors the magnetic flux generated in the magnetic toroid depends at all times on the vector sum of the currents in the active conductors (including the Neutral).

So, it means that the earth leakage protection will work correctly whatever the angles between the phases on balanced system as on two phases network in opposition.

As the voltage between phases is 480Vac, for earth leakage protection, we can only recommend to use an RCCB Multi9 GFP 4P (A-SI type) which is certified to be used at UeL/L=480Vac according to UL1053 Std (60Hz) but also according to IEC 61008-1 Std 50Hz in double certification. 

The A-SI type is recommended as it's the best proposed immunity to nuisance tripping in all cases of interference.

For instance we can propose to use GFP 4P 40A 30mA A-SI type reference part # M9R81440 according to the connection diagram below with earthed wire (0V) connected on the Neutral pole and the two Phases connected on the two first left phases poles to have correct working of the test button.