RA 84 SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE © 2002 TELEDYNE RELAYS
RA\072002\Q1
25A, 250 Vrms Optically Isolated
AC Solid-State Relay
FEATURES/BENEFITS
•Available with thermal protection and
thermal TRIP status: Provides self-
protection from thermal runaway
conditions and indicates protection
state for system BIT.
• Optical Isolation: Isolates control
elements from load transients with
reduced EMI.
• Fully Floating Output: Eliminates
ground potential loops and allows
the output to sink or source current.
•Buffered Control: Relay can be
controlled directly from TTL or
CMOS logic circuits.
•Integral Snubber Circuit: Enhances
dv/dt capability while minimizing
EMI.
DESCRIPTION
The Series RA solid-state relays (SSRs)
are designed for use in AC power
switching applications where safety and
reliability are primary concerns. These
SSRs are rated for load voltages up to
250 Vrms from 40 to 440 Hz and are
ideal for resistive and reactive loads with
power factors as low as 0.2. Inverse
parallel SCRs are configured for zero
voltage turn on and can handle current
surges up to 100 A. Optical isolation to
1500 Vrms between the control (input)
and load (output) allows the load to be
safely controlled by logic circuitry. RA
relays are available with thermal
protection and thermal TRIP status. In
case of a thermal runaway condition,
the SSR will shut down the output
switch and latch off until the input is
reset and the junction temperature
returns to a safe level. When the output
does latch off, the TRIP status line will
yield a logic level output indicating the
protection state of the SSR. This feature
provides the user with failure mode
indication while enhancing the system
diagnostic capability. These SSRs are
packaged in low-profile hermetically
sealed cases.
Series RA
Part Number* Relay Description
RA00HQ 25 A AC Solid-State Relay
RA58HQ 25 A AC Solid-State Relay with Thermal Protection
and Thermal TRIP Status
* The Y suffix denotes parameters tested to MIL-PRF-28750 specifications.
The W suffix denotes parameters tested to Teledyne specifications.
ELECTRICAL SPECIFICATIONS
(-55°C TO +110°C UNLESS OTHERWISE SPECIFIED)
INPUT (CONTROL) CHARACTERISTICS
2 Terminal Configuration (See Figure 1) Min Max Units
Input Voltage (See Note 2) 3.8 32 Vdc
Input Current
VINPUT = 5 Vdc 15 mA
VINPUT = 32 Vdc 16 mA
Turn-On Input Voltage 4.0 Vdc
Turn-Off Input Voltage 1.5 Vdc
Reverse Polarity -32 Vdc
INPUT (C0NTROL) SPECIFICATION
3 Terminal Configuration (See Figure 1) Min Max Units
Bias Voltage (See Note 2) 4.0 32 Vdc
Bias Current (VINPUT = 32 Vdc) 16 mA
Control Voltage Range 0 18 Vdc
Control Current at 5 Vdc 250 µAdc
Turn-On Control Voltage 0.3 Vdc
Turn-Off Control Voltage 3.2 Vdc
OUTPUT (LOAD) SPECIFICATIONS
Min Max Units
Load Voltage 20 250 Vrms
Frequency Range 40 440 Hz
Continuous Load Current (See Figure 3)
Without heat sink 0.2 5 Arms
With heat sink 0.2 25 Arms
Output Voltage Drop 1.5 Vrms
© 2002 TELEDYNE RELAYS (800) 284-7007 • www.teledynerelays.com RA 85
RA\072002\Q1
Series RA
OUTPUT (LOAD) SPECIFICATIONS
Min Max Units
Surge Current, at 25°C100 Arms
Leakage Current at 250 Vac, 400 Hz 10 mArms
Turn-On Time 1/2 cycle
Turn-Off Time 1 cycle
Zero Voltage Turn-On ±15 V pk
Load Power Factor 0.2
dV/dt 100 V/µs
Transient Voltage, (t < 5s) (See Note 4) ±500 V pk
Thermal Trip Temperature (Case) 120 150 °C
(RA58HQ Only)
Dielectric Strength (60 Hz) 1250 Vac
Insulation Resistance (@ 500 Vdc) 109Ohm
Input to Output Capacitance 20 pF
Junction Temperature at Rated Current 125 °C
Thermal Resistance Junction to Case 0.7 °C/W
Thermal Resistance Junction to Ambient 16 °C/W
STATUS OUTPUT TRUTH TABLE
Status Output State Control Input Output (Load) State
Off (High) Low On
On (Low) Low Tripped
Off (High) High Off
On (Low) High Non-Applicable Condition
STATUS OUTPUT SPECIFICATIONS
Min Max Units
Status Supply Voltage 3.8 32 Vdc
Status Leakage Current @ 32 Vdc 10 µAdc
Status Sink Current (VSO ≤ 0.4 Vdc) 10 mAdc
MECHANICAL SPECIFICATIONS
BLOCK DIAGRAM
RA 86 SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE © 2002 TELEDYNE RELAYS
RA\072002\Q1
Series RA
WIRING CONFIGURATION
FIGURE 1 (See note 1 & 2)
INPUT CURRENT VS INPUT VOLTAGE FIGURE 2
(See Note 2)
THERMAL DERATING CURVES
FIGURE 3
RA SERIES WITH HEAT SINK
(A)
RA SERIES WITHOUT HEAT SINK
(B)
ENVIRONMENTAL SPECIFICATIONS
Min Max Units
Temperature Range
Operating -55 +110 °C
Storage -55 +125 °C
Vibration 30 g, 10 2000 Hz
Constant Acceleration 5000 g
Shock (6 ms) 100 g
© 2002 TELEDYNE RELAYS (800) 284-7007 • www.teledynerelays.com RA 87
RA\072002\Q1
Series RA
SERIES LIMIT BIAS RESISTOR VS BIAS VOLTAGE
FIGURE 4 (SEE NOTE 2)
NOTES:
1. Control input is compatible with CMOS or open collector TTL (with pull up resistor).
2. For bias voltages above 6 Vdc, a series resistor is recommended. Use a standard resistor value equal
to or less than the value found from Figure 5.
3. Unless otherwise noted, the input voltage for functional tests shall be 5 Vdc.
4. Transient suppression must be used to limit the voltage to < 500 Vpeak when switching inductive loads.
5. Control input implies presence of bias voltage.
