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17
MCS
Solid State Soft-Start / Soft-Stop
Control Relay
25-90Amp
120/480 Vac
AC Output
MCBC
Solid State Burst Fire
Control Relay
25-90Amp
120/480 Vac
AC Output
The MCST, MCSP and MCSS series of controls is designed to
provide adjustable surge reducing soft-start and soft-stop control
for any load which would benefit from a gradual application or
shutdown of power, and provide Crydom SSR switching within one
package.
The MCS Control Relays are available with either soft-start, or soft-stop
functions separately, or as a combined soft-start/soft-stop control.
With adjustable ramp times from 100ms to 10 seconds in two
ranges, these controls are ideal for reducing starting current
surges in motors, in preventing saturation when switching
transformers, or in reducing reverse EMF surges when de-
energizing large inductive loads. Incorporating 4000 volt isolation
from input to output, the MCS series allows real time adjustment of
the ramp rates from a remote source using analog voltage or
current control. Once the desired ramp rate is set using the analog
input, a simple digital signal applied to the ON/OFF control input will
operate the control. The MCS is also available with a built-in
potentiometer for use where remote or continuous adjustment is
not needed.
Soft-Start/Stop Control and SSR in One Package
Microcontroller Based Technology
Adjustable Ramp Rates
Low Voltage, 4-20mA, or Potentiometer Control
LED Status Indicator
SCR Based Output Load Switching
Built-In
Internal Snubber
The Crydom MCBC series of Burst fire Controls, incorporate a
complete burst Fire logic system and Solid State Relay in one small
industry standard package. The MCBC uses microprocessor
control relay logic, accepts a wide range input logic power supply,
provides an output load status indicator, and five modes of analog
input control along with an Enable / Disable control.
With 2 time base periods available, (10 and 20 AC cycles), the
MCBC provides a smooth proportional control that minimizes
electrical noise by utilizing zero-cross detection and switching,
firing only complete AC cycles.
The MCBC does not require any calibration adjustment, is optically
isolated up to 4000 Vrms, and is available in load rating up to 90 A
and 530 Vac. In addition, specialized AC Phase Detection Circuitry
allows the MCBC to be connected to only one side of the load,
minimizing installation wiring.
The MCBC series is particularly suited to electrical heating
applications where the electrical noise generated by typical phase
angle controller can not be tolerated.
Vrms Arms Vdc Sec.
MCST2425AS 180-280 .15-25 0-5 .1-1 Soft Start UL
MCST2450AS 180-280 .15-50 0-5 .1-1 Soft Start UL
MCST2490AS 180-280 .15-90 0-5 .1-1 Soft Start UL
MCSP2425BM 180-280 .15-25 0-7 1-10 Soft Stop UL
MCSP2450BM 180-280 .15-50 0-7 1-10 Soft Stop UL
MCSP2490BM 180-280 .15-90 0-7 1-10 Soft Stop UL
MCSS2425CM 180-280 .15-25 0-10 1-10 Soft Start/Stop UL
MCSS2450CM 180-280 .15-50 0-10 1-10 Soft Start/Stop UL
MCSS2490CM 180-280 .15-90 0-10 1-10 Soft Start/Stop UL
MCST4825AS 300-530 .15-25 0-5 .1-1 Soft Start UL
MCST4850AS 300-530 .15-50 0-5 .1-1 Soft Start UL
MCST4890AS 300-530 .15-90 0-5 .1-1 Soft Start UL
MCSP4825BM 300-530 .15-25 0-7 1-10 Soft Stop UL
MCSP4850BM 300-530 .15-50 0-7 1-10 Soft Stop UL
MCSP4890BM 300-530 .15-90 0-7 1-10 Soft Stop UL
MCSS4825CM 300-530 .15-25 0-10 1-10 Soft Start/Stop UL
MCSS4850CM 300-530 .15-50 0-10 1-10 Soft Start/Stop UL
MCSS4890CM 300-530 .15-90 0-10 1-10 Soft Start/Stop UL
Other ranges available
Line Voltage
Range
Load Current
Range
Type
Analog
Input
Range
Ramp
Time
On/Off
Burst Fire Control/SSR in One Package
Low Voltage, Current, or Potentiometer Control
Output Status Indicator (Load Open, No Voltage)
0-100% Control Range
2 Time Base Periods Available
Separate Output Enable / Disable Control
SCR Based Output Load Switching
Internal Snubber Network Included
Vrms Arms Vdc
MCBC2425A 180-280 .15-25 0-5 UL
MCBC2450A 180-280 .15-50 0-5 UL
MCBC2490A 180-280 .15-90 0-5 UL
MCBC2425B 180-280 .15-25 0-7 UL
MCBC2450B 180-280 .15-50 0-7 UL
MCBC2490B 180-280 .15-90 0-7 UL
MCBC2425C 180-280 .15-25 0-10 UL
MCBC2450C 180-280 .15-50 0-10 UL
MCBC2490C 180-280 .15-90 0-10 UL
MCBC4825A 330-530 .15-25 0-5 UL
MCBC4850A 330-530 .15-50 0-5 UL
MCBC4890A 330-530 .15-90 0-5 UL
MCBC4825B 330-530 .15-25 0-7 UL
MCBC4850B 330-530 .15-50 0-7 UL
MCBC4890B 330-530 .15-90 0-7 UL
MCBC4825C 330-530 .15-25 0-10 UL
MCBC4850C 330-530 .15-50 0-10 UL
MCBC4890C 330-530 .15-90 0-10 UL
Other ranges available
Line Voltage
Range
Load Current
Range
Analog
Input
Range
Control Relays
Other Crydom products and competitive part number cross-reference available at: www.crydom.com
Part Number Nomenclature
SC2524STMC
Ramp Time On/Off
S: 100ms - 1 sec.
M: 1 sec. - 10 sec.
Analog Input
A: 0-5Vdc
B: 0-7Vdc
C: 0-10Vdc
D: 4-20mA
E: Potentiometer
Line Voltage
12: 48-140Vrms
24: 180-280Vrms
48: 330-530Vrms
Product Type
ST: Soft Start
SP: Soft Stop
SS: Soft Start/Stop
Rated Current
25: 25 Amps
50: 50 Amps
90: 90 Amps
SERIES
Part Number Nomenclature
FC2524BCMC
Time Base Period
F: 10 AC Cycles
L: 20 AC Cycles
Analog Control Signal
A: 0-5Vdc
B: 0-7Vdc
C: 0-10Vdc
D: 4-20mA
E: Internal Potentiometer
Line Voltage
12: 48-140Vrms
24: 180-280Vrms
48: 330-530Vrms
Product Type
BC: Burst Fire
Controller
Rated Current
25: 25 Amps
50: 50 Amps
90: 90 Amps
SERIES
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