Page last updated Oct 20, 2021 @ 10:08pm

RSZ vs RST

Comparison
Cummins Automatic Transfer Panels
series RSZ versus RST

The RSZ Automatic Transfer Panel was introduced in 2001 as a lower cost alternative to the RST series.  Both will work with the

Characteristic

 RSZ Series RST Series
Manufacturer GE Zenith (for Cummins) Cummins
Ampere Ratings 100 amp, 200 amp 60 amp, 100 amp, 200 amp
Enclosures indoor NEMA 1 and
outdoor NEMA 3R		 indoor NEMA 1 only
Front Cover screw-on hinged door
Enclosure Size:
  60 amp
  100 amp
  200 amp
not available
18" H x 18" W x 8" D
24" H x 18" W x 10" D
29" H x 18" W x 11.3" D
29" H x 18" W x 11.3" D
34" H x 21.5" W x 11.3" D
Time Delay Settings:
  start time delay
  transfer time delay
  retransfer time delay
  stop delay
5 sec
20 sec
300 sec
300 sec
3 sec
3 sec
300 sec
300 sec
Utility Undervoltage Sensing:
  dropout
  pickup
80%
90%
64%
85%
Generator Voltage Sensing:
  pickup
90%
85%
Generator Frequency Sensing:
  pickup
95%
n/a
Exerciser Clock Mounting factory installed shipped loose for field
mounting inside door

Exrciser Clock Time Settings
     (see footnote)

 set using jumpers for 7, 14, 21 or 28 day exercise schedule, run duration fixed at 10 minutes 7 day, 24 hour clock
can store & execute up to four start/stop programs per day of one minute minimum (no maximum) duration each
Exerciser Clock Transfer can be set for transfer or no transfer (test under load or test at no load) transfers to test ggenset under load
Battery Charger fixed output voltage output voltage adjustable
Cost lower cost higher cost

Footnote: Some manufacturers recommend exercising generators at least 30 minutes a month with a load.  The RSZ can be set to perform four 10 minute tests per month but cannot be set to automatically perform a single 30 minute test.   The RST can do this 30 minute test.

 

 

 

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