MARS SERIES 903 Catalog Page
MARS General Purpose Switching Relays
®
ARS SERIES
M
SPST and SPDT Fan Relays
The MARS Series 903 relays are among the most popular relays used in air conditioning
today. They will replace the WR/Essex/RBM Type 84 (90-290 thru 90-295) quick-connect
and screw terminal versions.*
Features:
• 0.25 inch quick-connect terminals
• Packaged with instructions and cross reference
• Replace 90-290 thru 90-295 and 90-290Q
thru 90-295Q
• Dimensions: 2.38 x 1.63 x 1.50 in.
• UL and CSA listings available
COIL
VOLTAGE
24 90290 90293
110/120 90291 90294
208/240 90292 90295
MARS NO.
SPST
903
MARS NO.
SPDT
COMPONENT
Contact Rating—All Models/Amps
VOLTAGE
120 12 60 18
240 8 48 18
277 7 42 18
FULL
LOAD
LOCKED
ROTOR
RESISTIVE
Cross Reference Information
WR/RBM MARS WR/RBM MARS
NO. REPLACEMENT NO. REPLACEMENT
90-290* 90290 90-293* 90293
90-290Q 90290 90-293Q 90293
90-291* 90291 90-294* 90294
90-291Q 90291 90-294Q 90294
90-292* 90292 90-295* 90295
90-292Q 90292 90-295Q 90295
SPDT
MARS
NO.
90296 24 3 amps 1.5 amps
COIL
VOLTAGE
CONTACT RATING
125 VAC 250 VAC
Coil Data: 24-240 VAC @ 50/60 Hz;
5 VA Max. Inrush; 3.0 VA
Max. Sealed
*For Screw Terminal Versions, use
MARS No. 93029 push-on to screw-on
adaptors.
Heavy Duty Fan Relays
MARS Heavy Duty Fan Relays are used on heating and air conditioning equipment to
provide switching of heavier loads with a compact size relay.
MARS Heavy Duty Fan Relays replace WR/Essex/RBM type 184.
Features:
• 0.25 inch quick-connect terminals
• Packaged with instructions and cross
reference
• Replaces WR/Essex/RBM Type 184
• Universal mounting bracket
• UL and CSA listings available
COIL
VOLTAGE
24 90360 90370 90380
110/120 90362 90372 90382
208/240 90364 90374 90384
277 90377
MARS NO.
SPST
MARS NO.
SPDT
MARS NO.
SPNO-SPNC
Contact Rating—All Models/Amps
VOLTAGE
120 12 60 18
240 8 48 18
277 7 42 18
FULL
LOAD
LOCKED
ROTOR
RESISTIVE
Coil Data
COIL
VOLTAGE
24 5 VA 3 VA
120 5 VA 3 VA
208/240 5 VA 3 VA
MAX
INRUSH
SEALED
MAX.
Cross Reference Information
WR/RBM MARS NO. WR/RBM MARS NO.
90-360 90360 90-374 90374
90-362 90362 90-380 90380
90-364 90364 90-382 90382
90-370 90370 90-384 90384
90-372 90372
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