Hoffman ATEMNCF and ATEMNCC cross to the Pfannenberg FLZ 520, and ATEMNOF and ATEMNOC cross to the FLZ 530. The contact type and the switching ratings match: 15 A at 120 V AC, 10 A at 240 to 250 V AC, 30 W DC. Both snap onto 35 mm DIN rail and use a bimetal sensor. The table lists each Hoffman number.
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Hoffman to Pfannenberg FLZ
| Hoffman | Contact and use | Pfannenberg, °F dial | Pfannenberg, °C dial |
|---|---|---|---|
| ATEMNCF | N.C., opens on rise. Heater. °F dial | FLZ 520, 17111000010, 32 to 140°F | FLZ 520, 17111000000, 0 to 60°C |
| ATEMNCC | N.C., opens on rise. Heater. °C dial | FLZ 520, 17111000010, 32 to 140°F | FLZ 520, 17111000000, 0 to 60°C |
| ATEMNOF | N.O., closes on rise. Fan. °F dial | FLZ 530, 17121000010, 32 to 140°F | FLZ 530, 17121000000, 0 to 60°C |
| ATEMNOC | N.O., closes on rise. Fan. °C dial | FLZ 530, 17121000010, 32 to 140°F | FLZ 530, 17121000000, 0 to 60°C |
| ATEMNC (older) | N.C. Heater | FLZ 520, 17111000010 | FLZ 520, 17111000000 |
| ATEMNO (older) | N.O. Fan | FLZ 530, 17121000010 | FLZ 530, 17121000000 |
| THERM16F / THERM16C | N.C. Heater. 40 to 140°F / 5 to 60°C | FLZ 520, 17111000010 | FLZ 520, 17111000000 |
| THERM26F / THERM26C | N.O. Fan. 40 to 140°F / 5 to 60°C | FLZ 530, 17121000010 | FLZ 530, 17121000000 |
Sources: nVent Hoffman Temperature Control Switch spec sheet (Spec-00583) and Thermostat Controller data sheet. Pfannenberg FLZ 510 / 520 / 530 product sheet and Pfannenberg USA FLZ datasheet. These are matches by published contact type and ratings. Hoffman and Pfannenberg have not published this cross. Need a colder or hotter set point? The FLZ 520 and 530 also come in -20 to +40°C and +20 to +80°C ranges (heater versions shown; fan versions 17121000003 and 17121000004).
Side by side
| Hoffman ATEMN series | Pfannenberg FLZ 520 / 530 | |
|---|---|---|
| Contact | N.C. or N.O., quick acting | N.C. (520) or N.O. (530), snap action |
| At 120 V AC | 15 A resistive, 2 A inductive | 15 (2) A |
| At 240 to 250 V AC | 10 A resistive, 2 A inductive (250 V) | 10 (2) A (240 V) |
| DC | 30 W | Max. 30 W |
| Switching difference | 7 K ±4 K | Under 7 K, tolerance ±4 K |
| Sensor | Bimetal | Bimetal |
| Mounting | 35 mm DIN rail, EN 60715 | 35 mm DIN rail, EN 60715 |
| Protection | IP20 | IP 20 |
| Size H x W x D | 2.36 x 1.30 x 1.62 in (60 x 33 x 41 mm) | 2.83 x 1.57 x 1.42 in (72 x 40 x 36 mm) |
| Listing | cURus E164102, CSA 215952, CE | UL, cUL, CSA, CE |
Sources as above. The FLZ is 12 mm taller and 7 mm wider. Check DIN rail space before you swap. In the brackets: inductive load at cos φ 0.6.
Need one part for a fan and a heater?
The Pfannenberg FLZ 510, 17103000000 has a changeover contact. One set point switches a fan on as the cabinet warms, or a heater off. N.C. side: 100 to 250 V AC, 10 (2) A. N.O. side: 100 to 250 V AC, 5 (2) A. For two separate set points, like the Hoffman ADLTEMP dual thermostat, use one FLZ 520 and one FLZ 530, or ask us for the Pfannenberg FLZ 541 / 543 twin thermostat.
Common questions
Is the FLZ 520 a direct replacement for the Hoffman ATEMNCF?
On ratings, yes. Both are N.C. bimetal thermostats for heaters, rated 15 A at 120 V AC and 10 A at 240 to 250 V AC. Use 17111000010 for a °F dial like the ATEMNCF. Check DIN rail space, since the FLZ is a bit larger.
Which one runs a fan?
The N.O. thermostat. Its contact closes as the cabinet warms. That is the Hoffman ATEMNOF or ATEMNOC, and the Pfannenberg FLZ 530.
Where should the thermostat go in the cabinet?
For a heater, Pfannenberg and Hoffman both say to mount it high in the cabinet, as far from heat sources as you can. Keep the vent slots clear.
How do I set it for a heater?
Add the switching difference to the lowest temperature you will allow. Hoffman gives this example: need 5°C (41°F) minimum, add 11 K (7 K + 4 K), set the knob to 16°C (61°F).
Can it switch a 1,000 W heater at 120 V?
1,000 W at 120 V is about 8.3 A, under the 15 A resistive rating. Fan heaters have a motor, so check the inductive rating (2 A) and the heater data. Use a relay for bigger loads.
Get it crossed and quoted
Send the Hoffman catalog number from the label and how many you need. We send back the Pfannenberg part with lead time.
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Hoffman and nVent are trademarks of nVent Services GmbH or its affiliates. Applied Control Inc. is not affiliated with nVent. Hoffman data is from nVent published spec sheets and is shown only to identify the part being replaced. Check the current manufacturer datasheet before you specify.