Danfoss vlt soft starter mcd 500 - UL Fuse Selection and Short Circuit Ratings

Model
SCR I
2
t (A
2
s)
Supply voltage Supply voltage Supply voltage
(<440 V AC) (<575 V AC) (<690 V AC)
MCD5-0469B 320000 6.9URD32D11A0700 – –
MCD5-0525B 781000 6.9URD32D11A0800 – –
MCD5-0632B 781000 6.9URD33D11A0900 – –
MCD5-0744B 1200000 6.9URD33D11A1100 – –
MCD5-0826B 2530000 6.9URD33D11A1250 – –
MCD5-0961B 2530000 6.9URD33D11A1400 – –
MCD5-0245C 320000 6.9URD31D11A0450 6.9URD31D11A0450 6.9URD31D11A0450
MCD5-0360C 320000 6.9URD33D11A0630 6.9URD33D11A0630 6.9URD33D11A0630
MCD5-0380C 320000 6.9URD33D11A0700 6.9URD33D11A0700 6.9URD33D11A0700
MCD5-0428C 320000 6.9URD33D11A0700 6.9URD33D11A0700 6.9URD33D11A0700
MCD5-0595C 1200000 6.9URD33D11A1000 6.9URD33D11A1000 6.9URD33D11A1000
MCD5-0619C 1200000 6.9URD33D11A1000 6.9URD33D11A1000 6.9URD33D11A1000
MCD5-0790C 2530000 6.6URD33D11A1400 6.6URD33D11A1400 –
MCD5-0927C 4500000 6.6URD33D11A1400 6.6URD33D11A1400 –
MCD5-1200C 4500000 6URD233PLAF2200 6URD233PLAF2200 –
MCD5-1410C 6480000 6URD233PLAF2200 6URD233PLAF2200 –
MCD5-1600C 12500000 6URD233PLAF2800 6URD233PLAF2800 –
Table 4.11 European Style (PSC 690)
4.10.4 UL Fuse Selection and Short Circuit Ratings
2 short-circuit current ratings (SCCR) are available for UL-compliant applications.
Standard fault currents (@600 V AC circuits)
The standard fault currents are determined referring to UL 508, section 1, table 51.2. This standard species the short-circuit
current that the soft starter must withstand based on the horse power rating (or full load current (FLC) rating, or locked
rotor amps (LRA) depending on the model).
If using the standard fault current ratings, the fuse must be in accordance with the information in Table 4.12 (that is model-
and manufacturer-specic).
High available fault currents (@480 V AC circuits)
It is possible to specify short-circuit current ratings exceeding the minimum ratings set by the standard fault currents when
the soft starter is able to withstand the high available short-circuit current in accordance with the UL 508 test.
If using the high available fault current ratings, select a suitable fuse based on amperage and fuse class (J or L as
applicable).
Electrical Installation
VLT
®
Soft Starter MCD 500
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