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A02B-0007-0030現貨 in stock! 歡迎來電咨詢~！！

A02B-0007-0030,

A02B-0007-0030

滾珠絲杠在機床行業的普遍應用，推動了加工機床行業的快速發展，但機械式傳動的局限性，已無法應對日益高速化、高效化切削的發展趨勢。直線電動機式就是在這種趨勢的需求下產生的一種高速高效傳動方式，特別是機床的高速傳動發展跨上一個新臺階。德國作為世界先進機床的先驅，20世紀80年代就開始了高速銑削和車削技術的研發。1993年，德國EXCELLO公司推出了世界上第一個由直線電動機驅動的工作臺HSC-240型高速加工中心，機床主軸最高速達到24 000r/min，最大進給速度為60n/min，加速度達到1g。

當進給速度為20m/min時，其輪廓精度可達0.004mm。美國的Ingersoll公司緊接著推出了HVM-800型高速加工中心，最大進給速度達到75.20m/m i n。

1996年開始，日本相繼研制成功采用直線電動機的臥式加工中心、高速機床、超高速小型加工中心、超精密鏡面加工機床、高速成形機床等。從此以后，直線電動機在高速數控機床的應用如雨后春筍般地迅速發展起來。近十年來，世界上各工業發達國家紛紛投入巨資，大力研究、開發成功不少直線電動機驅動的高速數控機床，并逐漸有搶占傳統滾珠絲杠市場的態勢。

直線電動機加工中心在國外的寶馬、通用等著名汽車公司已經有成熟的應用，在國內上汽通用、東風雪鐵龍、昌河鈴木、海馬汽車等也有整線的應用實例。本文從技術分析和應用實例上進行了直線電動機和滾珠絲杠驅動加工中心的對比。圖1為Comau Urane25直線電動機高速加工中心。
傳動原理分析對比滾珠杠副存任的問題如下：

（1）“旋轉電動機+滾珠絲杠副”的直線驅動方式存在著多個彈性環節，當整個系統在高速運動時，會出現剛度下降，同時彈性變形使系統的階次變高，系統的魯棒性降低，從而使伺服性能下降。彈性變形是數控機床產生機械諧振的根源。

（2）中間傳動環節的存在，增加了運動體的慣量，使得位移和速度響應變慢。

（3）間隙死區、摩擦、誤差積累等因素，使進給速度和加速度受到限制。

（4）動轉平穩性較差，在高速運動下噪聲易發熱。

（5）精度保持壽命相對短。
而直線電動機以—個運動部件實現直線運動，則具有以下優點：直接驅動中力是無接觸傳遞的，因此無磨損，使用壽命長，維護簡單；傳動剛性高，推力平穩，直接驅動，彈性環節減少，系統剛性提高，傳動效果高；定位精度和重復定位精度高，可達亞微米級，比伺服電動機及滾珠絲杠副傳動的加速度和重復定位精度提高7～10 倍。

上億庫存，國內外近千個倉庫，公司部分產品型號如下，歡迎聯系哦~！

194E-A16-1753-4N 16 A 194E Load switch

2090-CFBM7DD-CEAF40 40 m Length SpeedTec Flexible Cable

2090-CPWM7DF-08AA12 MP-Series 12m Standard Power Cable

2094-PRS3 Kinetix 6000 Slim Power Rail

DEMOCD00006 Cimplicity Change Management DEMO CD

GF-8030R Connecting FlashCable to Bellingham Stanley Refractometer.

IC200PNS001 PROFINET Scanner (PNS) module interfaces a remote node of VersaMax modules to a PROFINET IO Controller. Two 10/100 Mbps copper interfaces. Requires Proficy Machine Edition 7.0

IC646CSPR001 Proficy Cause+ for Intelligent HMI/SCADA Runtime Server - 1X monitored KPI

IC647CSPC001 Proficy Cause+ for Intelligent HMI/SCADA Client Enabler - 1X CAL

IC647PRTSQLC Proficy Portal SQL Server Connector (M1 Key)

IC693MAR590LT Mixed I/O, 120Vac Input (8 points), Relay Output (8 points) (LT)

IC756ADV010J-97 DV Draw Development on AIX Op Sys, Japanese, Version 9.7

MSI-MGMT-10 Production Management Clients 10 Pack

PLC-5/1771 System 1771-DMC1 CONTROL COPROCESSOR - MAIN MODULE

Distributed I/O 1738-IE2CM12 24VDC 2 ANALOG CURRENT INPUTS WITH M12 CONNECTORS

Communications 1770-KFDG DEVICENET RS-232 ADAPTER W/GLOBAL 9V

Operator Interface 2711-NV5 ANTIGLARE OVERLAY PV600 KEY & KEY&TOUCH

Support 9302-TIDR SUPT REINSTATEMENT CONTRACT FOR 9302TID

Support 9324-RL5LDRENR SUPT REINSTATEMENT CONTRACT FOR 9324RL5LDREN

DeviceNet Products 2706-P92C INVIEW MESSAGE DISPLAYS

RSI Software Products 9301-2SE335FRU2R RSVIEW32 RUNTIME 300-5K UPGRADE OUT-SUPT (FR)

RSI Software Products 9371-EDES1U2 UPGRADE: IN-SUPT: RSWIRE DTLR JIC/ACAD TO DES STD

Motion Control MPG-A025-091S22 MOTOR,SERVO,GEAR RATIO 91,100NM,62RPM,SINGL,230V

Silver Series 2711-K14C1 PV1400 COLOR KEY, RIO & RS232 PRINT

HE693RTM705 RTU / Modbus master module for Series 90-30 with 1 RS-232 port, 1 RS-485 port, supports Report by Exception.

IC670ALG320 Analog Output Current/Voltage 4 Pt. Grouped

QPI-DEM-CV2 QUICKPANEL DEMO 10.5" VIDEO

ST-5641 STXi 1 Channels, Pulse Out module, 0.5A/24V, Source, 20Khz

20BC205A3AYNANC0 PowerFlex 700 AC Drive 20B

20F1ANC170JN0NNNNN PowerFlex 753 AC Packaged Drive

22B-B012F104 PowerFlex 40 2.2 kW (3 Hp) AC Drive

140DDI85300 Quantum 開關量 DC 輸入, 32點, 10-60 VDC, 4組隔離

284D-FVD4P0Z-10-CR DeviceNet Variable Frequency Drive

E3S-GS3E4 3cm,溝形, 晶體管輸出80mA, 電源:12-24VDC

1492-SPJ3 IEC Term Blck Beige Separation Plt

人機界面 6AV6545-0AH10-0AX0 MP270B 觸摸屏，256 色，5.7 英寸，320? 240

6ES73317KB024AB1

1497B-A3-M16-0-N Control Power Transformer

1606-XLS480F 200 to 240VAC In 48 to 56VDC Out 480W PS

1769-IF4I CompactLogix 4 Pt A/I C and V Iso Module

189-AR11 MCB Accessory Auxiliary Contact

194R-HM4-N1 194R 100-400 A Operating Handle

2090-CPBM7DF-14AA03 MP-Series 3m Standard Cable

2090-XXNPMP-16S90 MP-Series 90 m Length Power Cable

CBL-38-MP-10 Power cable for MTR-3S80 series servo motors. 10 feet

GF-0231R Connecting FlashCable to Brown & Sharpe Digit Cal Mark IV.

IC200TBX240 Tool box, Micro 40, operator interface and software. Includes (IC200UDD040) 24VDC In/24VDC Out, requires 24VDC power, (IC200USB001) RS-232 option board with (2) 0 -10VDC analog in with VersaMax DataPanel DP 45 (IC200DTX450) with Proficy programming

IC646TBSPMPW002 Smart Process Monitoring Process+ Web Clients 2 Pack

IC647NSL025 Proficy SQL 2005 - 25 Client Access Licenses (order as separate item, not an option)

IC693ACC337 TBQC Base for IC693MDL654/655/752/753

IC752CBT013RR Datapanel 320T ME (Mono Expansion)w/ Advanced software: 320x240 1/4 VG A Mono LCD with 386SX/40. Analog touch screen w/ text, bitmaps, bar g raphs, real time clock. With 2M memory & PC/104. With Real Time Trends & Host Communications.

IC800VMCP2050 Power cable for 2 kW VersaMotion servo motors- 5 meter

SLC/1746 System 1746-NI16I (16) ANALOG INPUT MODULE, +/- 20 MA

Industrial Computers 6189V-CPUPFM2 PERFORMANCE SBC (W/CPU AND COOLER) (1400R)

Application-specific products 1403-CF001 2 X 1 M F LINK FOR POWERMONITOR

Operator Interface 2711-B6C8L1 PV600 COLOR KEY&TOUCH, DH+ & RS232 PRINT

Support 9301-2SE2400ITS SUPT RENEWAL CONTRACT FOR 93012SE2400IT

Support 9307-EMRTR SUPT REINSTATEMENT CONTRACT FOR 9307EMRTENE

DeviceNet Products 1734-IV4 24V DC 4 CHANNEL SOURCE INPUT MODULE

RSI Software Products 9301-2SE3100DEE RSVIEW32 RUNTIME 150 (GERMAN)

RSI Software Products 9358-BNTK10ENE RSBATCH BACK-UP KEY 10 UNITS

Motion Control MPL-B330P-SJ24AA MOTOR,SERVO,4.18 NM,5000RPM,SINGL,460V,BRK,6.1KG

Motion Control 2090-U3CK-D44 CONNECTOR KIT 44 PIN D SUB, CNTRL I/O INTERFACE CN

GFK-0731 ECLIPS (State Logic) Programming for Series 90-70 PLC User's Guide

IC646FXMU10 Proficy Change Management 10 Users System

MSC-RTD-C Obsolete - 100W PT (-200 to 850C) in / 4-20 mA out

PSPC-DCL Prof Shop Floor SPC DC 1 User

20BC015A3AYNAND0 PowerFlex 700 AC Drive 20B

20F11FD014AA0NNNNN PowerFlex 753 AC Packaged Drive

2198-KITCON-PWR70 CONKIT,K5500,FR3 POWER

2711P-RBT7 PanelView Plus Accessory

280A-EXT1 ArmorStart w/ Terminator Resistor Cable

CQM1-OD213 輸出32點.晶體管NPN 24V DC 100mA

1492-N44 TERM BLCK High Rise MTG Rail

連接電纜 6ES7368-3BB01-0AA0 IM360/361 連接電纜， 1m

變送器 3RS18001AP00

TIA 博途 WinCC 選件 6AV2107-0LB00-0BB0 SIMATIC WinCC DataMonitor for Runtime Professional 1 Client

1585J-M8MBJM-5 RJ45 Ethernet Media

1760-L12BBB-ND Pico 12 Point DC Controller

188-K2C060 6 A Miniature Circuit Breaker

194L-A20-1753 20A 194L Load Switch

2090-CNSRPRS-AA03 Kinetix 6000M Network Cable

2090-UXTBMP-18S40 MP-Series 40 m Length Brake Cable

BC647MQP001 Machine Edition View for Quick Panel 1 user with Proficy GlobalCare Complete with USB Hardware key

GC647IFSTRN00075 GCC iFIX Std HMI 75 I/O Run

IC200CPU001 CPU 34K user configurable user memory, 1.80MSEC/K Boolean one RS232 and one RS485 serial ports

IC646MVD000 ME View View OPC Driver License w/o Global Care and Software Key

IC647IFSTRN00300K iFIX Standard HMI 300 I/O Runtime (M1 Kit Part)

IC670GBI002RR Genius Bus Interface Unit (BIU)

IC697HSC700RR High Speed Counter

IC800SKCPZ100 Power cable to connect an S2K to any 30 - 750 Watt S-series servo motor. 10 meters

ControlLogix/1756 System 1756-M02AE 2-AX SERVO,ANALOG/ENC-ICP

Industrial Computers 6182H-12BRH15B VVCE 1250, KEY/TOUCH, STD MEM, CNET, AC

Process Control 1757-PFBEXP002 PROFIBUS INTERFACE MODULE EXPANSION

Operator Interface 2711P-RL7C PV PLUS/VVCE 700 BACKLIGHT REPLACEMENT

Support 9355-WABOEMITS SUPT RENEWAL CONTRACT FOR 9355WABOEMIT

Support 9354-SS505R 9354-SS505 SOFTWARE SUPPORT CONTRACT REINSTATEMENT

ControlNet Products 1734-IB8 24V DC 8 CHANNEL SINK INPUT MODULE

RSI Software Products 9301-2SE2400U1R UPGRADE: OUT-SUPT: RSVIEW WORKS 1500 TO 32K

RSI Software Products 9357-CNETMDAD3E RSNETWORX MD FOR CONTROLNET ADD-ON

Motion Control MPL-A330P-SJ24AA MOTOR,SERVO,4.18 NM,5000RPM,SINGL,230V,BRK,6.1KG

Motion Control 2090-UXNBMP-18S90 CABLE,ULTRA,NON-FLEX,MOTOR BRAKE,MP 90 MTR.

CBL-138-2 Cable. Allen Bradley SLC500 1747-KE (RS-232)

IC600WD005 I/O Cable, 5 feet (1.5m)

IC800SKCFLY030 Cable, S2K Aux. I/O Connector to Flying Leads, 3 Meter

OC647IFESGSR00300M iFIX Optn: ESig & ERec 300 I/O Server (M4 Part)

20AD065A0AYNANG0 PowerFlex 70 AC Drive 65 A at 50 Hp 20A

20DC650N0ENNBNANE PowerFlex 700S AC Drive 650 A 355 kW 20D

20P21AD027RA0NNN PowerFlex 27 A DC Drive

2711-NC13 PanelView 5 m Operate Comms Print Cable

280-PWRM22F-M2 ArmorStart Three-Phase Power Media

FX2N-1PG-E 定位模塊

1492-MC5X10 IEC 5 x 10 mm Marker Card

1494U-D100 1494U 100A Switch and Mechanism

軟啟動器 3RW44536BC44

SIMATIC STEP 7 V14 6ES7822-0AA04-0YE5 Upgrade SIMATIC STEP 7 基本版 V11..V13 -> V14 浮動授權

1585D-M4UBDF-10 1585D Ethernet Media Patchcord

1756-IF16H ControlLogix 16 Pt A/I HART Module

1794-TBNF Flex Terminal Base

194E-E16-PD10 194E 1 NO-EB Auxiliary Contact Block

2090-CFBM4DF-CDAF09 MP-Series 9m Feedback Cable

2090-KPB47-12CF MP-Series Cable Bulkhead Adaptor

BC5005TBW0000 15 Inch Intelligence Industrial Computer - Bundled - Performance Series - w/ Windows 2000

GC646TRT000 Proficy GlobalCare Complete for Server Unlimited Runtime System

HMI-BEZ-204 Stainless Steel Bezel: 6 inch Color & Mono (QPK2xxxx-L2P/ -S2P)/ NEMA 4X

IC641CTL930 Control 90-30 Programmer with CD Documentation Library

IC647IEC001 IEC 61850 Client - 1000 points

IC660EBA020 Electronic Assembly for IC660BBA020

IC695FTB1S032 Fiber terminal Block kit includes the IC695FTB001 base plus two IC694TBS032 high density spring style terminal blocks

IC756WRE024J-23 DataViews Runtime for Windows 1-24, Per User, Japanese, Version 2.3

FlexLogix System 1794-ADN DEVICENET ADAPTER WITH 24V DC POWER SUPPLY

PLC-5/1771 System D1771-6.5.83 REMOTE I/O ADAPTER MODULE USER MANUAL

Process Control 1757-PLXRT05 PROCESSLOGIX 5 USER REMOTE OPERATOR INTERFACE

Operator Interface 2711P-T7C4B1 PV PLUS 700, TOUCH, ENET, AC PS, STD MEM

Support 9307-RSE16S SUPT RENEWAL CONTRACT FOR 9307RSE16

Support GML-DAR SUPT REINSTATEMENT CONTRACT FOR GMLDA

Support F1785-L20CSERD FIRMWARE UPGRADE FOR 1785-L20C PLC5 PROCESSOR MODU

RSI Software Products 9301-2SE220ZHU1R RSVIEW32 WORKS 150-300 UPGRADE OUT-SUPT (ZH)

RSI Software Products 9701-VWSB100FRU2 RSV SE STATION 100 TO SE SRV 100 UPG (FRENCH)

RSI Software Products 9399-INTDCUUG INTERCHANGE DEVICE CONFIG. UTILITY USER'S GUIDE

Motion Control 2098-DSD-HV220X-DN HIGH VOLTAGE DRIVE, 47A/94A, ULTRA3000 W/DNET,INDE

BC646MBP001 Machine Edition View for Quick Panel, Professional Dev. Suite

IC300DIQ716 16 DC Inputs (12/24vdc), 12 DC Outputs (5/12/24vdc,o.5A pos. logic with ESCP)

IC752MNL002 Datapanel 100 Series Operator's Manual

MTR-3S63-G-R-0-E-SRR Servo Motor with Seal

ZA06B-6114-K204#S Motor encoder straight connector for all Bis series motors

20BP325A0ANNNNC0 PowerFlex 700 AC Drive 20B

20G1ABC540AN0NNNNN PowerFlex 755 AC Packaged Drive

25A-B1P6N104 PowerFlex 523 0.2kW (0.25Hp) AC Drive

2711P-T12W22D9P-B PanelView Plus 7 Graphic Terminal

OPC-F1-LNW(Lonworks)

1492-JG35 35 square mm Ground Terminal Block

1492-WG16S IEC Term Blck 8x47.6x41mm Screw

軟啟動器 3RW44223BC36

性能信號模塊 6ES7 531-7KF00-0AB0 AI 8：模擬量輸入模塊，AI 8x U/I/RTD/TC ST, ( 支持 4 通道 RTD), 35mm 模塊，不含前連接器

156-B45CB1 45 A Contactor

1746-NI8 SLC 8 Point Analog Input Module

1787-RSCABL 6FT (1.82 M)9-9PIN NULL MODEM RS-232 CBL

193-T1DC90 72-90 A IEC Bimetallic Overload Relay

20-IP54RF-600 ROOF, IP54/N12, FOR 600MM WIDE POWERFLEX

2090-CSBM1DF-14AF10 Kinetix Cable Single DSL 2090-Series

20AC022C0AYNANC0 PowerFlex 70 AC Drive 22 A at 11 kW 20A

GA647WFL000 Proficy GlobalAssist Complete for Proficy Workflow - Site License

GPA-602-F3 LVDT Expansion Unit (Full Bridge for MD5/500AG), includes G-0602 conne cting cable.

IC600CP610RR 13 inch Series Six Plus CPU w/o Power Supply (8 Slots)

IC647HSTCSEO20000KM eSignature Option for Historian - Enterprise Corporate Server 20,000,000 Points (M4 Key)

IC647WFL010 Proficy Workflow - 10 User License

IC694ALG220 Input module, analog 4 point voltage.

IC756RDV010E-98 DV Draw Development on IRIX Op Sys, English, Version 9.8

MicroLogix 1200 System 1762-MM1RTC MEMORY MODULE WITH RTC

PLC-5/1771 System 1771-LIA LOOP CONTROLLER INTERFACE MODULE

Distributed I/O 1794-OA8 85-132 VAC OUTPUT MODULE, 8 POINT

Communications 9355-WABPTE RSLINX PRO - PORTUGESE

Operator Interface D6195-6.5.4FR CONTROL/VW & CONTROL/VW 300 RUNTIME REF MNL FRENCH

Support 9358-BERP02R SUPT REINSTATEMENT CONTRACT FOR 9358BERP02ENE

Support F1771-ACN15SERB FIRMWARE UPGRADE FOR 1771-ACN15 PROCESSOR

RSI Software Products 9324-RL03U7ENE RSLOGIX 500 STD TO PRO UPGRADE

RSI Software Products 9301-2SE350DEU4R RSVIEW32 RUNTIME 150-100K UPGRADE OUT-SUPT (DE)

RSI Software Products 9358-HSTS2350U1 UPGRADE: IN-SUPT: HISTORIAN 150 TO 5K TAG

Motion Control W-4050-P-H00AB MOTOR,SERVO,WASHDOWN,BF,5.4 NM,3000RPM,14.1KG

612A-FT-SI-N4 Numeric Keypad Entry, 4 Digit LED DISP., Full Travel Keys. Sinking Output, NEMA 4

IC200MDD842LT MIXED 24VDC POS LOG OUTPUT 0.5A GRP WITH ESCP 16PT / INPUT GRP 16PT (LT)

IC695STK002 Includes RX3i and QuickPanel View 6 inch STD with software (one each IC695CPU310/ IC695CHS012/ IC69 5LRE001/ IC695PSA040/ IC695ETM001/ IC694ACC300/ IC694MDL940/ IC754VSI06STD/ BC646MQP001/ IC646MPP001 and DC power)

MTR-1220-N-A-E-0RR Stepping Motor Nema23

Z44A718031-G05 Alpha i-series servo bus bar kit for 60 mm wide module

20BD077A0AYNAND0 PowerFlex 700 AC Drive 77 A 60 Hp 20B

20G11NC022AA0NNNNN PowerFlex 755 AC Packaged Drive

22F-B025N104 PowerFlex 4M- 5.5 kW (7.5 HP) AC Drive

990NAD23010 Quantum MB+ TAP接頭,RUGGEDIZED

29340-018-01-R M8-1.25 HEX NUT STYLE 1

Y92F-30 面板安裝夾，

1492-SPM2D500 MCB Supplementary Protector 50 A

軟啟動器 3RW40242TB05

電機啟動器 3VU16401CR00

150-F361NCD SMC Flex Smart Motor Controller

1732E-OB8M8SR ARMORBLOCK 8 POINT SCHEDULED OUTPUT

1771-WHF FUSED WIRING ARM

193-EENH E1 Plus 120-600 A Overload Relay

20-750-BUS1A-F8 PF755 FR8, DC BUS ACCESS, IP20/IP54 CABT

2090-CPWM7DF-10AA12 MP-Series 12m Servo Power Cable

2097-V32PR4-LM Kinetix 350 1.7kW Servo Drive

ET-GT-5ES-1 5 RJ45 Port Ethernet Switch

GFK-1918 CIMPLICITY Machine Edition Logic Developer-PLC Getting Started guide

IC220MDD850 INPUT, THERMISTOR, 1 PT (REQUIRES 1 IC220TBK061)

IC647CTRAN1 Trane Tracer XT Micro cooling plant bundle - For ordering by Trane Only

IC647PSF200 Proficy Process Systems 2000 I/O with iFIX

IC693MDL240CA Conformal Coated Input module 120 VAC 16 points

IC756CDV000K-97 DV Development - Compaq True64 Op Sys, Korean, Version 9.7

MSI-MGMT-SV Production Management Server Software

PLC-5/1771 System 1785-L46B PROTECTED PLC-5/40 CONTROLLER, 48K WORD SRAM

Distributed I/O 1738-ADNX DEVICENET EXPANSION ADAPTER

Communications 1770-KFC15 SERIAL/PARALLEL INTERFACE CARD

Operator Interface 2711-NR6K 19" RACK MOUNT KIT FOR 1000/1000E KEYPAD TERMINALS

Support 9304-WVD300S SUPT RENEWAL CONTRACT FOR 9304WVD300

Support 9324-RLD25U6ITE RSLOGIX 5000 LITE ITALIAN TO FULL UPGRADE

DeviceNet Products 2711-K5A10L3 PV550 MONOCHROME KEY, DNET & RS232 PRINT

RSI Software Products 9301-2SE335PTU3R RSVIEW32 RUNTIME 1500-5K UPGRADE OUT-SUPT (PT)

RSI Software Products 9371-EDESI2U4 UPGRADE: IN-SUPT: RSWIRE DET IEC STD TO DES IEC/A

Motion Control MPG-B025-031S24 MOTOR,SERVO,GEAR RATIO 31,100NM,156RPM,SINGL,BRK

Silver Series 2711-T14C14 PV1400 COLOR TOUCH, MBUS & RS232 PRINT

HE693STP111 same as STP110E w/optical isolation, independent accel/decel

IC670MDL330 12 - 120Vac 16 Point 1A Output

QPJ2D100L2P/S QUICKPANEL JR. MONO 5" WITH EPOXY SEAL

ST-7511 STXi 24VDC Expansion power module 5 VDC booster , 1 amp , with module ID type with LED

20BC2P1A0AYNAND0 PowerFlex 700 AC Drive 20B

20F1ANC367AA0NNNNN PowerFlex 753 AC Packaged Drive

22B-B2P3F104 PowerFlex 40 0.4 kW (0.5 Hp) AC Drive

140DAO84220C Quantum 開關量AC輸出,16點,24-48VAC,4組隔離,CC

284D-FVD7P6B-25-RRN-3-DB-SB-EMI DeviceNet Variable Frequency Drive

E3F3-T61 5m 對射式，明通，NPN晶體管輸出100mA電源：10-30VDC 直徑18mm

1492-SPM1B060-N MCB Supplementary Protector 6 A