CII FC-325 Series Relays
Hermetically Sealed, Non-Latching 25-Amp Relays Featuring
Double Make/Break Contact Design, All Welded Enclosure, and
MS27418 Qualification
AEROSPACE, DEFENSE & MARINE /// FC-325 SERIES RELAYS
CII FC-325 Series Relays
Compact, Hermetically Sealed, Non-Latching Relays
FC-325 Series relays from TE Connectivity (TE) are hermetically sealed devices
designed for harsh inductive, motor, and lamp load applications in aerospace,
defense, and marine markets.
Configured as a 3PST/NO (DM), the double make/break contact design of the CII
FC-325 Series relays oer higher capability than comparable relays in the market.
It shares the load across two contact sets, resulting in less wear and tear on the relay.
This provides stable performance and extends the relay’s life. The relay’s all welded
design creates a reliable alternative to similar solder sealed relays in the market.
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PAGE 3AEROSPACE, DEFENSE & MARINE /// FC-325 SERIES RELAYS
CII FC-325 Series Relays
MECHANICAL/ENVIRONMENTAL
• Temperature Range: -70°C to +125°C
• Altitude: 80,000 feet
• Sinusoidal Vibration: 10 g/5 to 1000 Hz
• Shock: 50 g/11 ms
ELECTRICAL
• Dielectric Strength at Sea Level:
Coil to Case: 1250 Vrms
All Other Points: 1500 Vrms
• Dielectric Strength at 80,000 ft (25,000 m): 500 Vrms (all points)
• Insulation Resistance at 500 Vdc:
Initial: 100 MΩ min.
After Life or Environmental Test: 50 MΩ min.
• Contact Voltage Drop at Nominal Current:
Initial Value: 150 mV max.
After Life: 175 mV max.
OPERATIONAL
• Operate Time at Nominal Voltage:
AC: 25 ms max.
DC: 20 ms max.
• Release Time at Nominal Voltage:
AC: 50 ms max.
DC: 10 ms max.
• Bounce Time at Nominal Voltage: 2 ms max.
RUGGED
• Hermetically sealed
• Corrosion protected metal can
• All welded construction.
No solder sealing
SPACE AND WEIGHT SAVING
• 1.5 inch cube enclosure
• 0.452 lbs
CAPABLE
• Excellent for switching harsh
inductive, motor, and lamp loads
• -70°C to +125°C temperature range
• 80,000 feet altitude rating
VERSATILE
• 28 Vdc or 115 Vac coils
• Solder hook or terminal block
configurations
QUALIFIED
• Qualified to MS27418 specifications
• Higher current ratings than standard
M83536 mid-range relays
APPLICATIONS
• Launch Systems
• Power Distribution
• Fuel Pumps
• Guidance and Navigation Systems
• Aircraft Galley/Cabin Equipment
• Weapons Systems
• Ground Support Equipment
PAGE 4AEROSPACE, DEFENSE & MARINE /// FC-325 SERIES RELAYS
CII FC-325 Series Relays
Coil Characteristics
Contact Characteristics
Part Numbers
AC Coil DC Coil
Nominal Operating Voltage 115 Vac 28 Vdc
Maximum Operating Voltage 122 Vac 32 Vdc
Maximum Pick-Up Voltage at +125° C 95 Vac 18 Vdc
Maximum Pick-Up Voltage at +125° C
(Continuous Current test) 108 Vac 22.5 Vdc
Drop-Out Voltage at +125° C (Amps Max) 5.0 Vac 1.5 Vdc
Coil Current at +25° C .06 A @ 50/60 Hz
0.55 A @ 400 Hz —
DC Coil Resistance (±10%) —160 Ω
Back EMF Suppresses to (Vdc)
(Suppressed Versions) — 42 Vdc
Load Type Life Cycles
Current Rating (A)
28
Vdc
115 Vac, 1 Phase Power 115/200 Vac, 3 Phase Power
400 Hz 50/60 Hz 400 Hz 50/60 Hz
Resistive 50,000 25 25 25 25 25
Inductive 10,000 15 25 25 25 25
Motor 50,000 20 20 12 20 12
Lamp 50,000 10 10 10 10 10
Mechanical Life,
Reduced Current 200,000 6.3 6.3 6.3 6.3 6.3
Coil Terminal Mounting Mil Spec MS Part No. Comml Part No.
28 Vdc Solder Hook Stud MS27418-1B FC-325-2 FC-325-CW3
Screw Bracket MS27418-2B FC-325-5 FC-325-SY3
28 Vdc
(Suppressed)
Solder Hook Stud MS27418-1D FC-325-7 FC-325-CW4
Screw Bracket MS27418-2D FC-325-8 FC-325-SY4
115 Vac,
50/60 Hz
Solder Hook Stud MS27418-1C FC-325-3 FC-325-CW9
Screw Bracket MS27418-2C FC-325-6 FC-325-SY9
115 Vac,
400 Hz
Solder Hook Stud MS27418-1A FC-325-1 FC-325-CW8
Screw Bracket MS27418-2A FC-325-4 FC-325-SY8
DC Nonsuppressed and AC Coils DC Suppressed Coils
Circuit Diagram
Custom configurations are available. Consult TE.
.225
.244 1.062
±.005
2.000
+.005
.093 R
MAX
1.550
1.550
.187+.005 DIA.
4 PLS
2.000
1.12
±.03
1.062
1.50 SQ.
+.031
2.500
MAX
.173+.005 DIA
4 PLS 1.465
MAX
2.41
±.06
1.531
MAX
.04 TYP.
NAME PLATE
SCREW 6-32 UNC-2B, 250 LONG, 2 EACH
REQ. LOCKWASHER, NO.6, 2 EACH REQ.
SCREW 8-32 UNC-2B, 250 LONG, 6
EACH REQ. LOCKWASHER, NO.8, 6
EACH REQ.
PAGE 5AEROSPACE, DEFENSE & MARINE /// FC-325 SERIES RELAYS
CII FC-325 Series Relays
Dimensions
Solder Hook Terminals
(Shown with Mounting Studs)
Screw Terminals
(Shown with Mounting Bracket)
Tolerances are ±.010 unless otherwise noted.
1.406 DIA.
+.005
.593
1.187
+.005
.593
1.187
+.005
+ .005 DIA
- .001
4 PLS
1.531
MAX
1.531
MAX
.38
+.03
1.187
1.187
.375 -.000
1.680
MAX
+.032
0.152
NAME PLATE
.040 +.002 DIA 2 COIL
SOLDER HOOK TERMINALS
TINNED FINISH.
.080 +.002 DIA. 6
SOLDER HOOK TERMINALS
TINNED FINISH.
.138-32 UNC-2A
STUD, 4 EA REQ'D
Mounting Layout
Mounting Layout
te.com/fc325
AMP, AGASTAT, CII, DEUTSCH, HARTMAN, KILOVAC, LL ROWE, MICRODOT, NANONICS, POLAMCO, Raychem,
SEACON, TE, TE Connectivity and the TE connectivity (logo) are trademarks of the TE Connectivity Corporation.
Other products, logos, and company names mentioned herein may be trademarks of their respective owners.
While TE Connectivity (TE) has made every reasonable eort to ensure the accuracy of the information herein, nothing
herein constitutes any guarantee that such information is error-free, or any other representation, warranty or guarantee
that the information is accurate, correct, reliable or current. The TE entity issuing this publication reserves the right to
make any adjustments to the information contained herein at any time without notice. All implied warranties regarding
the information contained herein, including, but not limited to, any implied warranties of merchantability or fitness for a
particular purpose are expressly disclaimed. The dimensions herein are for reference purposes only and are subject to
change without notice. Specifications are subject to change without notice.
Consult TE for the latest dimensions and design specifications.
© 2017 TE Connectivity Corporation All Rights Reserved.
1-1773871-3  04/17   
AEROSPACE, DEFENSE & MARINE /// FC-325 SERIES RELAYS
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