Selection Guide

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Siemens Industry, Inc.
Industrial Controls Catalog
Heater Elements Class SMF
Heater Motor Full-Load List
Catalog Number Current (Amps) Price $
SMFH01 0.157–0.173
SMFH02 0.174–0.192
SMFH03 0.193–0.212
SMFH04 0.213–0.235
SMFH05 0.236–0.261
SMFH06 0.262–0.289
SMFH07 0.290–0.321
SMFH08 0.322–0.355
SMFH09 0.356–0.399
SMFH10 0.41–0.44
SMFH11 0.45–0.49
SMFH12 0.50–0.53
SMFH13 0.54–0.58
SMFH14 0.59–0.65
SMFH15 0.66–0.71
SMFH16 0.72–0.78
SMFH17 0.79–0.85
SMFH18 0.86–0.96
SMFH19 0.97–1.04
SMFH20 1.05–1.16
SMFH21 1.17–1.25
SMFH22 1.30–1.39
SMFH23 1.38–1.54
SMFH24 1.48–1.63
SMFH25 1.57–1.75
SMFH26 1.66–1.86
Heater Motor Full-Load List
Catalog Number Current (Amps) Price $
SMFH27 1.80–1.99
SMFH28 1.96–2.15
SMFH29 2.16–2.38
SMFH30 2.39–2.75
SMFH31 2.76–2.84
SMFH32 2.85–3.06
SMFH33 3.07–3.45
SMFH34 3.46–3.70
SMFH35 3.71–4.07
SMFH36 4.08–4.32
SMFH37 4.33–4.90
SMFH38 4.91–5.35
SMFH39 5.36–5.85
SMFH40 5.86–6.41
SMFH41 6.42–6.79
SMFH42 6.80–7.57
SMFH43 7.58–8.15
SMFH44 8.16–8.98
SMFH45 8.99–9.67
SMFH46 9.68–9.95
SMFH47 9.96–10.8
SMFH48 10.9–12.1
SMFH49 12.2–13.1
SMFH50 13.2–13.9
SMFH51 14.0–15.0
SMFH52 15.1–16.0
Table B—Special Applications
Heater Element Selection
Ambient Temperature of Motor
Constant 10°C Constant 10°C
Same as (18°F) Higher (18°F) Lower
Continuous
Controller Than Controller Than Controller
Duty Motor
Ambient Ambient Ambient
Service Factor Full Load Current Multiplier
1.15 to 1.25 1.0 0.9 1.05
1.0 0.9 0.8 0.95
Table A
Number of Heater Elements
Number of
Device Heater Elements Notes
SMFF*1
SMFF*2
All single pole and two pole SMF
SMFF*3
1 starters require only 1 Heater
SMFF*4
Element.
SMFF*5
SMFF*6
SMFF*22
2
Duplex Unit. One Heater Element
SMFF*44 per starter.
SMFF*11
2
Two Speed Starter. One Heater
SMFF*22 Element per speed.
Ordering Information
1. Determine number of heater elements required from Table A.
2. Determine motor full load current and service factor.
NOTE: If motor amps are unknown, an approximate value may be found on page 9/120. These values should
be used with caution and only when motor amps are not available.
3. If the motor and controller are in the same ambient temperature:
a. For 1.15 to 1.25 service factor motors use 100% of motor full load current for heater element selection.
b. For 1.0 service factor motors use 90% of motor full load current for heater element selection.
c. Heater elements are class 20.
4. If the motor and controller are in different ambient temperatures multiply motor full load current by the multiplier in
Table B. Use the resultant full load current for heater element selection.
5. Select proper heater element from table below.
6. All tables are based on the operation of the motor and controller in the same ambient temperature, 40°C (104°F) or
less. Always be certain the correct heater element is installed in the starter before operating the motor.
Siemens / Speedfax Previous folio: 16-152, 10IC 8-152
Product Category: NEMA
Manual Control
Heater Elements, Class SMF
General