We ship to the Philippines — door-to-door, customs and logistics handled by 3G Electric

3G Electric
RFQ CartGet a QuoteSign inSign up
Siemens Safety Switch: Non-Fusible, 30 A, Three Phase, 240V AC, Galvanized Steel - Non-Fusible Safety Switches
SiemensNon-Fusible Safety Switches

Siemens Safety Switch: Non-Fusible, 30 A, Three Phase, 240V AC, Galvanized Steel

SKU 3G-OTH-129147

Brand
Siemens
Item
Safety Switch: Non-Fusible, 30 A, Three Phase, 240V AC, Galvanized Steel
Category
Non-Fusible Safety Switches
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineer
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
Worldwide Shipping
Air & sea freight
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Technical Specifications

Siemens
Manufacturer Part Number
DTNF321
Type
30 A, Three Phase, Galvanized Steel, Indoor
AC
240V
View Full Spec Sheet

Technical Documents

No technical documents available for this product.
Request documentation →
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

Siemens Products
3G Electric (S) Pte. Ltd. — Singapore

Frequently Asked Questions

What is the SIEMENS DTNF321 safety switch used for?

The SIEMENS DTNF321 is a non-fusible safety switch used to safely disconnect three-phase electrical equipment during maintenance or emergencies. It is rated for 30 A at 240V AC and is suitable for indoor industrial applications requiring reliable power isolation.

What are the specifications of the SIEMENS DTNF321 safety switch?

The SIEMENS DTNF321 is a non-fusible safety switch rated 30 A, three-phase, 240V AC. It features a galvanized steel enclosure for indoor use. The manufacturer part number is DTNF321. This switch provides a manual disconnect point for branch circuits.

Where to buy the SIEMENS DTNF321 safety switch worldwide?

3G Electric supplies the SIEMENS DTNF321 safety switch to customers worldwide. We handle full logistics, customs clearance, and delivery to your site. As a global industrial solutions provider, we source genuine Siemens equipment and support your procurement from order to arrival.

How to install the SIEMENS DTNF321 non-fusible safety switch?

Install the SIEMENS DTNF321 in a dry indoor location on a sturdy surface. Ensure the supply is de-energized before wiring. Connect line and load conductors per the wiring diagram on the switch. Torque terminals to manufacturer specifications and verify proper grounding before energizing.

Used in

Common applications for Siemens
District cooling plants — LME73 + RWF55 for condenser-water modulation
Inflight catering and food-processing steam boilers — LMG22 with SQN90 air-fuel cross-damper
Hospital steam-plant redundancy — LME41 with QRA2 UV flame detection for dual-fuel boilers
Semiconductor fab process heat — LME23 and SKP55 gas valves on hot-oil heater skids
Container-terminal reefer-deck heating — LMG22 retrofit onto legacy burner racks

Siemens Products

3G Electric supplies Siemens non-fusible safety switches. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

You might also need

Burners & Combustion →Pumps & Compressors →Spare Parts →All Products →

Similar products

Matched by specification & description
SIEMENS Safety Switch: Non-Fusible, 100 A, Three Phase, 240V AC, Galvanized Steel, Indoor (MPN DTNF323). Key specifications — attr867131: SIEMENS.
Siemens
SIEMENS Safety Switch: Non-Fusible, 100 A, Three Phase, 240V AC, Galvanized Steel, Indoor (MPN DTNF323). Key specifications — attr867131: SIEMENS.
SIEMENS Safety Switch: Non-Fusible, 60 A, Three Phase, 240V AC, Galvanized Steel, Indoor (MPN DTNF322). Key specifications — attr867131: SIEMENS.
Siemens
SIEMENS Safety Switch: Non-Fusible, 60 A, Three Phase, 240V AC, Galvanized Steel, Indoor (MPN DTNF322). Key specifications — attr867131: SIEMENS.
SIEMENS Safety Switch: Non-Fusible, 30 A, Single Phase, 240V AC, Galvanized Steel, Indoor (MPN DTNF221). Key specifications — attr867131: SIEMENS.
Siemens
SIEMENS Safety Switch: Non-Fusible, 30 A, Single Phase, 240V AC, Galvanized Steel, Indoor (MPN DTNF221). Key specifications — attr867131: SIEMENS.
SIEMENS Safety Switch: Non-Fusible, 100 A, Three Phase, 240V AC, Galvanized Steel, Indoor/Outdoor (MPN DTNF323R). Key specifications — attr867131: SIEMENS.
Siemens
SIEMENS Safety Switch: Non-Fusible, 100 A, Three Phase, 240V AC, Galvanized Steel, Indoor/Outdoor (MPN DTNF323R). Key specifications — attr867131: SIEMENS.
SIEMENS Safety Switch: Non-Fusible, 30 A, Three Phase, 240V AC, Galvanized Steel, Indoor/Outdoor (MPN DTNF361R). Key specifications — attr867131: SIEMENS.
Siemens
SIEMENS Safety Switch: Non-Fusible, 30 A, Three Phase, 240V AC, Galvanized Steel, Indoor/Outdoor (MPN DTNF361R). Key specifications — attr867131: SIEMENS.
SIEMENS Safety Switch: Non-Fusible, 200 A, Single Phase, 240V AC, Galvanized Steel, Indoor/Outdoor (MPN DTNF224R). Key specifications — attr867131: SIEMENS.
Siemens
SIEMENS Safety Switch: Non-Fusible, 200 A, Single Phase, 240V AC, Galvanized Steel, Indoor/Outdoor (MPN DTNF224R). Key specifications — attr867131: SIEMENS.

More from Siemens

View all Siemens parts →
SIEMENS Safety Switch: Non-Fusible, 30 A, Three Phase, 600V AC, Galvanized Steel, Indoor (MPN DTNF361). Key specifications — attr867131: SIEMENS.
Siemens
SIEMENS Safety Switch: Non-Fusible, 30 A, Three Phase, 600V AC, Galvanized Steel, Indoor (MPN DTNF361). Key specifications — attr867131: SIEMENS.
SIEMENS Safety Switch: Non-Fusible, 60 A, Three Phase, 600V AC, Galvanized Steel, Indoor (MPN HNF462). Key specifications — attr867131: SIEMENS.
Siemens
SIEMENS Safety Switch: Non-Fusible, 60 A, Three Phase, 600V AC, Galvanized Steel, Indoor (MPN HNF462). Key specifications — attr867131: SIEMENS.
SIEMENS Safety Switch: Non-Fusible, 30 A, Single Phase, 600V AC, 304 Stainless Steel, Indoor/Outdoor (MPN HNF261S). Key specifications — attr867131: SIEMENS.
Siemens
SIEMENS Safety Switch: Non-Fusible, 30 A, Single Phase, 600V AC, 304 Stainless Steel, Indoor/Outdoor (MPN HNF261S). Key specifications — attr867131: SIEMENS.
SIEMENS Safety Switch: Non-Fusible, 200 A, Single Phase, 240V AC, Galvanized Steel, Indoor (MPN DTNF224). Key specifications — attr867131: SIEMENS.
Siemens
SIEMENS Safety Switch: Non-Fusible, 200 A, Single Phase, 240V AC, Galvanized Steel, Indoor (MPN DTNF224). Key specifications — attr867131: SIEMENS.
SIEMENS Safety Switch: Non-Fusible, 100 A, Three Phase, 600V AC, Galvanized Steel, Indoor (MPN HNF663J). Key specifications — attr867131: SIEMENS.
Siemens
SIEMENS Safety Switch: Non-Fusible, 100 A, Three Phase, 600V AC, Galvanized Steel, Indoor (MPN HNF663J). Key specifications — attr867131: SIEMENS.
SIEMENS Safety Switch: Non-Fusible, 60 A, Single Phase, 600V AC, Galvanized Steel, Indoor/Outdoor (MPN HNF262R). Key specifications — attr867131: SIEMENS.
Siemens
SIEMENS Safety Switch: Non-Fusible, 60 A, Single Phase, 600V AC, Galvanized Steel, Indoor/Outdoor (MPN HNF262R). Key specifications — attr867131: SIEMENS.
SIEMENS Safety Switch: Non-Fusible, 200 A, Three Phase, 600V AC, Galvanized Steel, Indoor (MPN DTNF364). Key specifications — attr867131: SIEMENS.
Siemens
SIEMENS Safety Switch: Non-Fusible, 200 A, Three Phase, 600V AC, Galvanized Steel, Indoor (MPN DTNF364). Key specifications — attr867131: SIEMENS.
SIEMENS Safety Switch: Non-Fusible, 200 A, Three Phase, 600V AC, Galvanized Steel, Indoor/Outdoor (MPN HNF364R). Key specifications — attr867131: SIEMENS.
Siemens
SIEMENS Safety Switch: Non-Fusible, 200 A, Three Phase, 600V AC, Galvanized Steel, Indoor/Outdoor (MPN HNF364R). Key specifications — attr867131: SIEMENS.