Siemens 42DF35AH Contactor
The 42DF35AH is a three-pole industrial contactor intended for motor branch and heavy-load switching circuits in control panels. It carries a 50 A per-pole rating, a 440–480 VAC coil, and auxiliary contacts in a box-style chassis-mount package.
42DF35AH Key Specifications
| Parameter | Value |
|---|---|
| Base Product Number | 42DF |
| Contact Rating | 50 A |
| Contact Form | 3PST-NO (3 Form A) |
| Coil Voltage | 440 ~ 480 VAC |
| Mounting | Chassis Mount |
| Encapsulation | Box |
| Features | Auxiliary Contacts |
| Operating Temperature | 70°C |
| Product Status | Active |
Coil Voltage Options Across the 42DF Series
The 42DF35AH belongs to a family of contactors sharing identical contact ratings, contact form, mounting type, and auxiliary-contact features. The coil voltage is the primary differentiating spec within this group.
| Coil Voltage | MPN |
|---|---|
| 440–480 VAC | 42DF35AH |
| 277 VAC | 42DF35AL |
| 24 VAC | 42DF35AJ |
| 208–240 VAC | 42DF35AG |
| 110–120 VAC | 42DF35AF |
42DF Series vs. Sibling Families: Current and Pole Configuration
Beyond the 42DF base, Siemens offers the 42CF and 42BF families with differing current ratings and pole counts. These variants retain the same chassis-mount form factor and auxiliary-contact feature set.
| Family | Base Number | Current Rating | Pole Count | Contact Form |
|---|---|---|---|---|
| 42DF | 42DF | 50 A | 3-pole | 3PST-NO |
| 42CF | 42CF | 40 A | 3-pole / 2-pole | 3PST-NO / DPST-NO |
| 42BF | 42BF | 30 A | 2-pole | DPST-NO |
The 42CF series includes a 3-pole 40 A variant (42CF35AH) with the same 440–480 VAC coil as the 42DF35AH. Lower-current 2-pole options exist in the 42CF and 42BF families with varying coil voltages.
Catalog Comparison
The following table presents the 42DF35AH alongside higher-similarity in-catalog peers sharing the same features, mounting type, and encapsulation. All require the reader's own qualification before use in a specific installation.
| Parameter | 42DF35AH | 42CF35AH | 42CF15AG | 42BF15AF |
|---|---|---|---|---|
| Base Product Number | 42DF | 42CF | 42CF | 42BF |
| Contact Rating | 50 A | 40 A | 40 A | 30 A |
| Contact Form | 3PST-NO (3 Form A) | 3PST-NO (3 Form A) | DPST-NO (2 Form A) | DPST-NO (2 Form A) |
| Coil Voltage | 440 ~ 480 VAC | 440 ~ 480 VAC | 208 ~ 240 VAC | 110 ~ 120 VAC |
| Mounting Type | Chassis Mount | Chassis Mount | Chassis Mount | Chassis Mount |
| Operating Temperature | 70°C | 70°C | 70°C | 70°C |
| Similarity | — | 0.775 | 0.725 | 0.725 |
Why these parts are similar: All four share the same brand, chassis-mount encapsulation, auxiliary-contacts feature, and a Siemens contactor form factor within the 42-series family. The 42CF35AH matches the 42DF35AH on coil voltage and pole count but drops to 40 A. The 42CF15AG and 42BF15AF reduce both pole count and current rating, with differing coil voltages.
FAQ
What distinguishes the 42DF35AH from the 42CF35AH? The 42DF35AH is rated for 50 A per pole versus 40 A for the 42CF35AH; both use a 440–480 VAC coil, 3PST-NO contact form, chassis-mount enclosure, and include auxiliary contacts.
Does the 42DF35AH operate on both 440 V and 480 V systems? The coil is specified for 440–480 VAC, which covers standard North American three-phase supply configurations in that range.
Can the 42CF15AG substitute for the 42DF35AH in a three-phase circuit? The 42CF15AG is a DPST-NO (2-pole) device rated for 40 A with a 208–240 VAC coil; it does not match the 3-pole configuration or current rating of the 42DF35AH.