
National Hybrid, Inc.
Advanced Microelectronic Technology
Solid State AC Power Controller (SSPC) - Model 90240-25AC
General Description
The 90240-25AC Series Power Controller is an 80
to 240 VAC, TTL controlled power switch de-
signed for aerospace and industrial applications.
This power controller is a solid state replacement
for 5 to 25 ampere AC circuit breakers. This de-
vice is externally programmable for I2t trip delay
and current trip point. Status reporting permits
sensing of normal operation, trip, over tempera-
ture, and failure conditions.
This device uses SCRs for switch elements pro-
viding low on-state voltage drop (<1.1Vrms). The
use of hybrid technology results in its small size
and high reliability.
The NHI advanced package design places the
power devices directly on the mounting tabs,
achieving the lowest electrical and thermal resis-
tance possible.
Applications
These devices are designed for use in land, air,
sea and space deployed systems that require high
reliability. Their exceptional performance and af-
fordability extend applications to industrial power
management and control.
Features
Instant Trip Protection (1/2 cycle) program-
mable to 1200%
Internal Thermal Protection
Optically Isolated Control and Status
Circuitry
Programmable to 10% of rated current
MIL-STD-704 and MIL-H-38534 compliant
Hermetically Sealed
Low Voltage Drop
Zero Voltage Sw itching
Low Cost
47 to 440 Hz Operation
High Reliability
Multiphase Operation
Line Terminal to
Signal Ground
80 to 240 Vrms
Control Input to
Signal Ground
0.0 to 5.0 Volts
Bias Suppl y Voltage
4.5 to 5.5 Volts DC
Table 2 – Recommended Op erating Conditions
Block Diagram - Model 90240-AC
NHi’s Series 90000 Solid State Power Controller
Storage T emperature
-65C to +150C
Operati ng
Temperature
-55C to +125C
Breakdown Voltage
(Line/Load Ter minals to
Ground)
600 VDC
Bias Suppl y Voltage
-0.5 VDC to 7 VDC
Table 1 – Ab solute Maximum Rating s
Power
Ground
Iso
latio
n
Ci
rcu
its
SCRs
SCR Driver,
Short Ckt. Ctrl,
I2TCtrland
Status Ckts.
Bias Supply
Command
Status 1
Status 2
Input
C
ont
rol
Ci
rcu
it
LINE
LOAD
Bleeder
Circuit
Bias Rtn
2200 Smithtown Ave., Ronkon koma, NY 11779 ● ( 516) 981-2400 ● F ax ( 516) 981-