Mars 33833 User Manual

Sequencers

MARS SERIES 338

33844

33841

Electric Heat Sequencers

he MARS2 heat sequencers are used in a variety of

T
applications, including electric furnaces, baseboard heaters,
heat pump blower control and heating element control. The
sequencers stage electric heat to prevent circuit overload.
These units operate by means of a PTC (positive
temperature coefficient). The PTC is self current limiting,
ensuring stable switching action over a wide range
of voltages.

Features:

• Solid state dependability

• Replaces Honeywell, White Rodgers, and Klixon

• 12.5A to 25A contact ratings

• Quick connect terminals

• Various mounting positions

• Shock & vibration resistant

• Ambient rated from -50ºF to 165ºF

• Full-load rated auxiliary contacts

Single Load Contact Ratings

RESISTIVE

(non-inductive)

VAC WATTS AMPS

120 3000 25 10A 60A 125VA
240 6000 25 5A 30A 125VA
480 6000 12.5 3A 18A 480VA

Combined Load Ratings:

MARS2

30A @ 240VAC - Total: 23A non-inductive + 7FLA / 42LRA inductive
Life at rated current: 10,000 cycles

FULL LOAD

MARS2 TIMINGS-ON TIMINGS-OFF

NO. TIMINGS SWITCHES M1-M2 M3-M4 M5-M6 M7-M8 M9-M10 M1-M2 M3-M4 M5-M6 M7-M8 M9-M10

33841 111-20 ----40-110 ----
33842 11--30 - 90 -- --1-30 --

(1)

33844
33845 12--30 - 90 30 - 90 ---1-30 1-30 -

(1)

33832

(1)

33833

(1)(2)

33848

(1) M1-M2 and M3-M4 are always first switches to turn ON and to turn OFF. All other switches are random ON and random OFF
(2) #33848 - switch contacts designated F1-F2 instead of M1-M2

121-20 1-20 -- -40-110 40 - 110 ---

231-110 1-110 1-110 --1-110 1-110 1-110 -­241-110 1-110 1-110 1-110 - 1-110 1-110 1-110 1-110 ­451-160 1-160 1-160 1-110 1-160 1-160 1-160 1-160 1-160 1-160







MOTOR RATINGS

(inductive)

LOCKED

ROTOR

PILOT DUTY














 These contacts switch simultaneously

ON TIME – Elapsed time to make contacts after heater is energized (Min. to Max.)
OFF TIME – Elapsed time to make contacts after heater is de-energized (Min. to Max.)
OFF Timings determined after PTC heater has been electrified for a total of 5 minutes.

M2-16

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