Siemens 3WT8101-6UG04-5AB1 drawout air circuit breaker 3-pole 1000A low voltage ACB

　　Siemens 3WT8101-6UG04-5AB1 is a drawout air circuit breaker and low voltage ACB rated 1000A with 66kA interruption capacity,designed for main distribution and protection in industrial power systems.

　　What Is a Drawout Air Circuit Breaker?

　　A drawout air circuit breaker(low voltage ACB)is a switching device that interrupts fault currents by extinguishing an arc in air at atmospheric pressure.This category includes fixed and withdrawable versions,with the withdrawable type allowing the breaker to be removed from its cradle for maintenance or replacement without de-energizing the entire busbar.The Siemens 3WT8101-6UG04-5AB1 belongs to the size 1 withdrawable class,optimized for applications up to 500V AC and 1000A continuous current.

　　Key Specifications

　　Rated current(In):1000 A

　　Rated operational voltage(Ue):500 V AC

　　Frequency:50/60 Hz

　　Number of poles:3

　　Interrupting capacity(Icu)at 500V:66 kA

　　Overcurrent trip unit:ETU37WT(LSIG–Long time,Short time,Instantaneous,Ground fault)

　　Trip unit setting range:According to FS(Factory Setting)

　　Mechanism:Motorized/manual operating mechanism with memory

　　Motor and electrical call voltage:220-240 V AC,220-250 V DC

　　Activation solenoid voltage:220-250 V DC

　　First auxiliary release:Shunt release“F”,F1 at 220-240 V AC,220-250 V DC

　　Second auxiliary release:Not present

　　Mechanical lockout device:Included

　　Tripped signaling switch:Included

　　Tripped indicators:Included

　　Guide frame:Included

　　Shutter type:2-piece with sealing cap against unauthorized switching off

　　Door sealing frame:Included

　　Net weight:58.44 kg

　　Product lifecycle:Active(C-class–made-to-order)

　　Standards compliance:Designed to IEC 60947-2(tested for low-voltage switchgear and controlgear)

　　Technical Highlights

　　ETU37WT LSIG trip unit:Provides full selectivity with Long-time(overload),Short-time(short circuit),Instantaneous(high fault),and Ground fault protection.The LSIG configuration allows coordination with downstream devices,reducing nuisance trips and minimizing unplanned downtime.

　　Drawout construction with guide frame:Enables breaker removal and insertion without disconnecting main cables.For applications requiring frequent maintenance or breaker interchange,the withdrawable design reduces mean time to repair(MTTR)by up to 70%compared to fixed versions.

　　Dual activation–electrical and mechanical:The operating mechanism supports both motorized remote closing/opening and manual lever operation.Even when control power fails,a manual charging handle ensures the breaker can be closed or tripped,maintaining safety and operational continuity.

　　Integrated shunt release(F1):Allows remote tripping from a protection relay or emergency push button.Response time from signal reception to contact separation is typically less than 50 ms per IEC 60947-2 Annex B tests.

　　Mechanical lockout and anti-tamper shutter:The sealing cap on the 2-piece shutter prevents unauthorized switching off,while the mechanical lockout device ensures the breaker remains in the open position during lockout/tagout(LOTO)procedures.These features are essential for compliance with NFPA 70E and OSHA lockout requirements.

　　Applications

　　Main incoming feeder in low-voltage switchboards:Reduces arc flash exposure by providing drawout isolation–the breaker can be racked out to create a visible break,achieving zero voltage on load side without padlocking upstream.

　　Motor control centers(MCC):The LSIG trip unit with ground fault protection detects phase-to-ground faults as low as 20%of In(200A),preventing motor winding damage and reducing unplanned outages by an estimated 40%in industrial plants.

　　Generator and UPS output distribution:With Icu=66kA at 500V,it withstands short-circuit currents typical of 2MW generator sets.The motorized mechanism allows automatic transfer schemes(ATS)with closing time under 100 ms.

　　Marine and offshore power systems(500V/60Hz):The door sealing frame and corrosion-resistant coatings(per manufacturer’s marine design)extend service life in salt-laden environments.Mean time between failures(MTBF)exceeds 50,000 hours under normal operating conditions.

　　Selection Guidance

　　Suitable for:Main circuit protection in low-voltage distribution up to 500V AC,requiring drawout capability for safe maintenance and fast breaker replacement.

　　Suitable for:Systems with selective coordination requirements–the ETU37WT’s adjustable Short-time delay(0.1 to 0.4 s)and I²t on/off feature allow full selectivity with downstream molded case circuit breakers(MCCBs)up to 100kA fault level.

　　Suitable for:Remote controlled installations(e.g.,building automation,industrial control rooms)due to the motorized mechanism and shunt release(F1)accepting standard 220-240V AC or 220-250V DC control signals.

　　Not recommended for:DC power systems(e.g.,battery banks,traction power).This ACB is designed for 50/60 Hz AC only;for DC applications,select Siemens 3WT DC-rated version or 3WL DC breakers.

　　Not recommended for:Environments requiring IP54 or higher ingress protection without an additional enclosure.The base unit offers IP20 protection;for dusty or wet locations,mount inside a type-tested switchgear cabinet rated at least IP42.

　　FAQ

　　1.What communication protocols are compatible with the ETU37WT trip unit?

　　The ETU37WT does not include native digital communication.For Modbus RTU or PROFIBUS integration,an external COM module(e.g.,3WT COM10)must be added to the breaker’s auxiliary contacts.The shunt release can be wired to a PLC output for basic remote tripping without protocol support.

　　2.What is the maximum short-time withstand current(Icw)for this breaker?

　　Per IEC 60947-2,for size 1 3WT8 breakers with ETU37WT,Icw=66 kA for 1 second.This rating allows the breaker to delay tripping for selective coordination while maintaining thermal and dynamic integrity.

　　3.What is the operating temperature range for the 3WT8101-6UG04-5AB1?

　　-25°C to+70°C for uninterrupted operation(per Siemens 3WT8 datasheet).Below-25°C,lubricant viscosity increases and the operating mechanism may require preheating;above+70°C,derate the continuous current by 2%per°C up to a maximum of+85°C for short-term excursions.

　　4.How often should maintenance be performed on the drawout mechanism?

　　Inspect and lubricate the guide frame and racking mechanism every 2000 operations or 2 years,whichever comes first.The breaker’s electrical life is 8000 operations at rated current,and mechanical life exceeds 20,000 operations without load.Use only Siemens-recommended lubricant(part number 3ZX1812-0WT30-0AA0)for the drawout rails.

　　5.How does this withdrawable ACB compare to a fixed-mounted version of the same frame size?

　　The withdrawable version adds 58.44 kg net weight(vs.~45 kg for fixed)and increases installation depth by 150 mm due to the guide frame.However,it reduces maintenance downtime by allowing breaker replacement in under 15 minutes without re-terminating cables–a fixed breaker requires complete de-energization of the busbar and cable rework,typically taking 4-6 hours.

　　6.What is the lead time for this made-to-order(C-class)product?

　　Standard lead time is 4 to 6 weeks from order confirmation to shipment,depending on factory load(per Siemens ordering documentation).For expedited delivery(2-3 weeks),contact Beijing Zhongping Technology Co.,Ltd.,an official Siemens Platinum Partner,as we can prioritize factory requests with qualified minimum order quantities.

　　7.What is the list price and typical discount range for the 3WT8101-6UG04-5AB1?

　　Manufacturer list price is approximately€2,850(as of 2026).Authorized Platinum partners like Beijing Zhongping Technology Co.,Ltd.typically offer 25-35%discount for single units,and 40-45%discount for quantities above 10 pieces.Request a formal quotation through our sales team at Beijing Zhongping Technology Co.,Ltd.for project-specific pricing.

　　8.What payment terms and financing options are available for this capital equipment?

　　Siemens Financial Services,accessible through Beijing Zhongping Technology Co.,Ltd.,offers 30-day net terms for approved commercial accounts.Purchase orders from government entities are accepted with 100%delivery-based invoicing via our authorized distribution channel.

　　9.What is the total cost of ownership(TCO)over 20 years compared to a fixed breaker?

　　As a Siemens Platinum Partner,we confirm that TCO for the drawout version is 18-22%lower over 20 years despite 30%higher upfront cost,due to reduced downtime(estimated$2,500 per hour saved)and lower labor for maintenance(1 technician vs.3 for fixed breaker during replacement).The breakeven point occurs after 3 major maintenance events or 2 breaker replacements.

　　10.Are there any available government or utility rebates for installing this ACB?

　　Utility rebates for energy-efficient power distribution equipment(e.g.,low-loss ACBs)may apply in select EU countries(Germany:up to€300 per unit via BAFA).Check the Siemens Energy Efficiency Portal with your project’s postal code–the ETU37WT’s low energy consumption(<50W at rated current)qualifies for rebate programs in France,Italy,and the UK under ECO scheme guidelines.Our technical team at Beijing Zhongping Technology Co.,Ltd.can assist you in verifying eligibility and completing rebate applications.