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

Other Crydom products and competitive part number cross-reference available at: www.crydom.com

Part Number Nomenclature

S

C

25

24

ST

MC

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

F

C

25

24

BC

MC

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