Send a part number, a photo, or a whole BOM — we supply it and stand behind it. Worldwide shipping to 80+ countries.

3G Electric
RFQ CartGet a QuoteSign inSign up
SIEMENS Miniature Circuit Breaker: 45 A Amps, 240V AC, 3 Poles - B Series, Bolt-On Siemens Miniature Circuit Breakers
SIEMENSB Series, Bolt-On Siemens Miniature Circuit Breakers

SIEMENS Miniature Circuit Breaker: 45 A Amps, 240V AC, 3 Poles

The Siemens B345H is a 45 A, 240V AC, three-pole miniature circuit breaker from the BL Series, designed for bolt-on use with Siemens P1 Panelboards. It carries a maximum interrupting rating of 22kA at 240V AC and is…

SKU 3G-OTH-721910

Brand
SIEMENS
Item
Miniature Circuit Breaker: 45 A Amps, 240V AC, 3 Poles
Category
B Series, Bolt-On Siemens Miniature Circuit Breakers
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineerMessage via Telegram
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
B345H
Series
BL
Type
Std
AC
240V
Amps
45 A
Phase
Three
Poles
3
For Use With
Siemens P1 Panelboards
Max. AIR Rating
22kA at 240V AC
AC Voltage Rating
240V AC
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

Product Description

The Siemens B345H is a 45 A, 240V AC, three-pole miniature circuit breaker from the BL Series, designed for bolt-on use with Siemens P1 Panelboards. It carries a maximum interrupting rating of 22kA at 240V AC and is classified as a standard type breaker.

Frequently Asked Questions

What is the Siemens B345H miniature circuit breaker used for?

The Siemens B345H is a 45 A, 240V AC, three-pole miniature circuit breaker designed for bolt-on use in Siemens P1 Panelboards. It provides overcurrent protection in commercial and industrial electrical distribution systems, with a 22kA interrupting rating at 240V AC.

What are the specifications of the Siemens B345H circuit breaker?

The Siemens B345H is rated 45 A, 240V AC, three-phase, three-pole, with a maximum AIR rating of 22kA at 240V AC. It is a standard type breaker from the BL Series, designed for bolt-on mounting in Siemens P1 Panelboards.

Where to buy the Siemens B345H circuit breaker worldwide?

3G Electric supplies the Siemens B345H miniature circuit breaker to customers worldwide. We handle full logistics, customs clearance, and delivery to your site. Contact us for pricing and lead time on this BL Series, 45 A, 240V AC, three-pole breaker.

How to install the Siemens B345H circuit breaker?

Install the Siemens B345H by bolting it directly into a Siemens P1 Panelboard. Ensure the panel is de-energized, torque terminals to manufacturer specifications, and verify the 45 A, 240V AC rating matches your circuit. Always follow local electrical codes and use proper PPE.

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 b series, bolt-on siemens miniature circuit breakers. 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 →

More from SIEMENS

View all SIEMENS parts →
Miniature Circuit Breaker: 25 A Amps, 120/240V AC, 2 Poles, Std (MPN B225). Key specifications — Amps: 25 A; AC Voltage Rating: 120/240V AC; Max. AIR Rating: 10kA at 120/240V AC; For Use With: Siemens P1 Panelboards; Phase: Single; Series: BL.
SIEMENS
Miniature Circuit Breaker: 25 A Amps, 120/240V AC, 2 Poles, Std (MPN B225). Key specifications — Amps: 25 A; AC Voltage Rating: 120/240V AC; Max. AIR Rating: 10kA at 120/240V AC; For Use With: Siemens P1 Panelboards; Phase: Single; Series: BL.
Miniature Circuit Breaker: 35 A Amps, 120/240V AC, 2 Poles, Shunt Trip (MPN B23500S01). Key specifications — Amps: 35 A; AC Voltage Rating: 120/240V AC; Max. AIR Rating: 10kA at 120/240V AC; For Use With: Siemens P1 Panelboards; Phase: Single; Series: BL.
SIEMENS
Miniature Circuit Breaker: 35 A Amps, 120/240V AC, 2 Poles, Shunt Trip (MPN B23500S01). Key specifications — Amps: 35 A; AC Voltage Rating: 120/240V AC; Max. AIR Rating: 10kA at 120/240V AC; For Use With: Siemens P1 Panelboards; Phase: Single; Series: BL.
Miniature Circuit Breaker: 60 A Amps, 120/240V AC, 2 Poles, Ground Fault Equipment Protection (MPN BE260H). Key specifications — Amps: 60 A; AC Voltage Rating: 120/240V AC; Max. AIR Rating: 22kA at 120/240V AC; For Use With: Siemens P1 Panelboards; Phase: Single; Series: BLE.
SIEMENS
Miniature Circuit Breaker: 60 A Amps, 120/240V AC, 2 Poles, Ground Fault Equipment Protection (MPN BE260H). Key specifications — Amps: 60 A; AC Voltage Rating: 120/240V AC; Max. AIR Rating: 22kA at 120/240V AC; For Use With: Siemens P1 Panelboards; Phase: Single; Series: BLE.
Miniature Circuit Breaker: 50 A Amps, 120/240V AC, 1 Poles, Std (MPN B150H). Key specifications — Amps: 50 A; AC Voltage Rating: 120/240V AC; Max. AIR Rating: 22kA at 120/240V AC; For Use With: Siemens P1 Panelboards; Phase: Single; Series: BL.
SIEMENS
Miniature Circuit Breaker: 50 A Amps, 120/240V AC, 1 Poles, Std (MPN B150H). Key specifications — Amps: 50 A; AC Voltage Rating: 120/240V AC; Max. AIR Rating: 22kA at 120/240V AC; For Use With: Siemens P1 Panelboards; Phase: Single; Series: BL.
Miniature Circuit Breaker: 30 A Amps, 120/240V AC, 1 Poles, Shunt Trip (MPN B13000S01). Key specifications — Amps: 30 A; AC Voltage Rating: 120/240V AC; Max. AIR Rating: 10kA at 120/240V AC; For Use With: Siemens P1 Panelboards; Phase: Single; Series: BL.
SIEMENS
Miniature Circuit Breaker: 30 A Amps, 120/240V AC, 1 Poles, Shunt Trip (MPN B13000S01). Key specifications — Amps: 30 A; AC Voltage Rating: 120/240V AC; Max. AIR Rating: 10kA at 120/240V AC; For Use With: Siemens P1 Panelboards; Phase: Single; Series: BL.
Miniature Circuit Breaker: 45 A Amps, 240V AC, 3 Poles, Std (MPN B345). Key specifications — Amps: 45 A; AC Voltage Rating: 240V AC; Max. AIR Rating: 10kA at 240V AC; For Use With: Siemens P1 Panelboards; Phase: Three; Series: BL.
SIEMENS
Miniature Circuit Breaker: 45 A Amps, 240V AC, 3 Poles, Std (MPN B345). Key specifications — Amps: 45 A; AC Voltage Rating: 240V AC; Max. AIR Rating: 10kA at 240V AC; For Use With: Siemens P1 Panelboards; Phase: Three; Series: BL.
Miniature Circuit Breaker: 30 A Amps, 120V AC, 1 Poles, Ground Fault Circuit Interrupter (MPN BF130A). Key specifications — Amps: 30 A; AC Voltage Rating: 120V AC; Max. AIR Rating: 10kA at 120V AC; For Use With: Siemens Panelboards; Phase: Single; Series: BF.
SIEMENS
Miniature Circuit Breaker: 30 A Amps, 120V AC, 1 Poles, Ground Fault Circuit Interrupter (MPN BF130A). Key specifications — Amps: 30 A; AC Voltage Rating: 120V AC; Max. AIR Rating: 10kA at 120V AC; For Use With: Siemens Panelboards; Phase: Single; Series: BF.
Miniature Circuit Breaker: 90 A Amps, 120/240V AC, 3 Poles, Shunt Trip (MPN B390HH00S01). Key specifications — Amps: 90 A; AC Voltage Rating: 120/240V AC; Max. AIR Rating: 65kA at 240V AC; For Use With: P1 Panelboards; Phase: Three; Series: BL.
SIEMENS
Miniature Circuit Breaker: 90 A Amps, 120/240V AC, 3 Poles, Shunt Trip (MPN B390HH00S01). Key specifications — Amps: 90 A; AC Voltage Rating: 120/240V AC; Max. AIR Rating: 65kA at 240V AC; For Use With: P1 Panelboards; Phase: Three; Series: BL.