DMS Accessories www.murata-ps.com 5 Amp AC Current Transformers GENERAL SPECIFICATIONS (ALL MODELS) Insulation Class 600V, 10kV BIL full wave (1) Frequency Range 50-400Hz Supplied Secondary Max. Secondary Lead Rated Accuracy Burden See Table 1 UL FIle No. CSA File No. These commercial grade, UL & CSA recognized, "donut style" AC current-transformers (CTs) provide an isolated 0-5A output that can be used with Murata Power Solutions' ACA5 Series of digital ammeters. Installation is straightforward: simply pass the load-carrying conductor through the 5A CT's primary window, and then route its secondary's leads through the ACA5-ammeter's built-in, low-burden, toroid sensor. All models feature rugged, fully insulated construction, allowing continuous operation with primary voltages up to 600Vac, at line frequencies from 50 to 400Hz. Fourteen models are available to enable accurate measurements from 50A through 2000A. When combined with Murata Power Solutions' ACA5 Series ammeters, secondary lead-extensions may be used for those applications where the CT cannot be installed in the immediate vicinity of the ammeter. TECHNICAL NOTES Weight (1) Basic Lightning Impulse Insulation Level (BIL): The insulation strength referenced to the crest value of an impulse voltage-waveform which rises to a crest value in 1.2 microseconds, then drops to 1/2 the crest value in 50 microseconds. AC POWER SUPPLY ACA5-20PC-X-ACX TO AC LOAD TB1 A B L1 5A CURRENT TRANSFORMER (see technical notes) 0-5A OUTPUT Figure 1. Typical Connections For full details go to www.murata-ps.com/rohs IMPORTANT! To ensure safe and reliable operation, Current Transformers and associated equipment must be installed and serviced by qualified technical personnel. Never open the CT's secondary connections while the primary is energized. Open CT secondary wiring can generate potentially lethal voltages when the primary circuit is energized. Contact Murata Power Solutions if you have any doubts regarding the installation or operation of any of our ac-mains measurement instruments and accessories. 1. CT Precautions: In normal operation, a 5A current transformer's secondary circuit operatesatarelativelylowvoltageduetoitsclosed-loop,lowburdenconfiguration(essentially zero Ohms when used with Murata Power Solutions'ACA5 series ammeters). However, anyCTcangeneratepotentiallylethalvoltagesifitsoutputcurrentissuddenlyinterrupted. Forexample,loosesecondaryconnectionscanproduceaconditionreferredtoas"inductivekick."Inductivekickcangenerateextremelyhighvoltagesacrosstheopensecondary connections. Therefore, all connections made to a CT's secondary leads must only be performed with zero current flowing in the primary circuit. Never operate a CT with its secondary circuit open and current flowing in the primary. 2. CT Connections and Grounding: Some applications require connecting one of the CT's 5A output terminals to earth/chassis ground. In the USA, consult the latest revision of the National Electrical Code for more information. After all mechanical assembly is completed, pass the 5A secondary leads through the ACA5 ammeter's built-in toroid, then connect the two leads together as shown in Figure 1. For this connection, and for connections involving lead extensions, pressure-style connectors (commonly called"wire nuts") are acceptable as long as they are rated for the currents and voltages involved. 3. Installation: CT's must be installed in a manner that ensures no excessive stresses are applied to the primary conductor that passes through the CT or to the secondary circuit anditsassociatedinstruments.Useplastictie-wrapsand/orothersuitablenon-conductive restraining devices to secure the CT. www.murata-ps.com/support MPM_DMS-CT.B05 Page 1 of 4 DMS Accessories 5 Amp AC Current Transformers TECHNICAL NOTES 4. Reference Documentation: Prior to connecting CTs to any measurement device (analog or digital), relay, or other apparatus, be sure to thoroughlyreviewtheapplicabledevice'stechnicaldocumentation(for example,MurataPowerSolutions'ACA5-20PCproductdatasheet).In particular, make sure the CT's ratings meet the requirements of your application. burden column. Accuracy measurements are taken at 100% primary current,usingaresistiveburdenandanominallinefrequencyof60Hz. 7. Polarity: CTs are marked with `H1' (primary) and `X1' (secondary) polarity indicators.When a CT's only function is to measure amperes, polarity markings can be disregarded. However, correct polarity is mandatory in applications in which the phase relationship between two currents is involved (watt or watt-hour meters are two examples ofpolaritysensitiveapplications).Refertotherespectiveinstruments' documentation for more information. 5. Secondary Lead Extensions: When calculating the total burden imposed on a CT's 5A output, Murata Power Solutions'ACA5 digital ammeters'input impedance is negligible and can be assumed to be zero Ohms. In many applications, the length of secondary wiring can be increased up to the value specified in Table 1 without adversely affecting performance. 8. Thermal Rating Factor:The thermal rating factor denotes the amount by which the primary current can be increased on a continuous basis over its rated value without exceeding the CT's maximum temperature rise. In order to achieve the specified accuracy, the maximum permissible burden must not exceed the value shown inTable 1.When used with ACA5 ammeters, the total burden is the sum of the resistance of the CT's 24" leads and any lead-extensions. Make sure all connections are securely tightened and properly strain relieved. If terminal blocks are used for intermediary connections, refer to the manufacturer's torque recommendations. The formula below can be used to calculate thermal rating factors at temperatures above 30C. NRF = (85 - NAT)(RF) 2 NAT NRF = Rating Factor at New Ambient Temperature RF = 30C Rating Factor NAT = New Ambient Temperature Table 1 lists general guidelines for adding lead extensions when usingMurataPowerSolutions'ACA5-Seriesammetersasthereadout device. The lengths in Table 1 assume the lead extensions are 16AWG.Stateddimensionsareone-waydistancesbetweentheACA5 and the CT. Make sure all secondary extensions meet or exceed the specifications of the CT's built-in leads. In order to minimize external noise pick up, lead extensions should be as kept short as possible. Example: Find the 55C. thermal rating factor of a 2000:5 CT whose 30C rating factor is 1.3. NRF = 6. Accuracy: The indicated accuracy specifications are valid as long as the total secondary burden does not exceed the value in Table 1's (85 - 55)(1.3) 2 55 = 0.96 Table 1. Selection Guide MPS Part No. Current Ratio Accuracy (@ 60Hz) Burden VA (Ohms) Lead Ext. Feet (Meters) Thermal Rating Factor (@ 30C) 7020-01036-0 50:5 2% 1.5 (0.06) 4 (1.2) 1.3 7020-01037-0 75:5 2% 3.0 (0.12) 10 (3.0) 1.3 7020-01038-0 100:5 1% 3.0 (0.12) 10 (3.0) 1.3 7020-01039-0 150:5 1% 6.0 (0.24) 20 (6.1) 1.3 7020-01040-0 200:5 1% 8.0 (0.32) 30 (9.1) 1.3 7020-01041-0 250:5 1% 10.0 (0.40) 40 (12.2) 1.3 7020-01123-0 300:5 1% 12.5 (0.50) 50 (15.2) 1.0 7020-01124-0 400:5 1% 12.5 (0.50) 50 (15.2) 1.0 7020-01125-0 500:5 1% 20.0 (0.80) 80 (24.4) 1.0 7020-01042-0 600:5 1% 10.0 (0.40) 40 (12.2) 1.0 7020-01043-0 750:5 1% 10.0 (0.40) 40 (12.2) 1.0 7020-01044-0 1000:5 1% 10.0 (0.40) 40 (12.2) 1.0 7020-01045-0 1500:5 1% 12.5 (0.50) 50 (15.2) 1.0 7020-01046-0 2000:5 1% 15.0 (0.60) 60 (18.3) 1.0 UL File Cert # CSA File Cert # Leads Type Weight (lb) E175133 Pending 16AWG, 24" UL Style 3173 1.5 E466945 260320 1.0 16AWG, 24" UL Style 1015 E228202 223647 1.5 See www.murata-ps.com/dpm-availability for model-specific availability. www.murata-ps.com/support MPM_DMS-CT.B05 Page 2 of 4 DMS Accessories 5 Amp AC Current Transformers MECHANICAL SPECIFICATIONS 1.4 (35.6) X1 2.7 (68.6) 1.2 (30.5) DIA Models: 7020-01036-0 - (50:5) 7020-01037-0 - (75:5) 7020-01038-0 - (100:5) 7020-01039-0 - (150:5) 7020-01040-0 - (200:5) 7020-01041-0 - (250:5) H1 1.10 (27.9) X1 3.56 (90.4) 1.56 (39.6) DIA Models: 7020-01123-0 - (300:5) 7020-01124-0 - (400:5) 7020-01125-0 - (500:5) H1 1.13 (28.7) X1 4.50 (114.3) 3.00 (76.2) DIA H1 Models: 7020-01042-0 - (600:5) 7020-01043-0 - (750:5) 7020-01044-0 - (1000:5) 7020-01045-0 - (1500:5) 7020-01046-0 - (2000:5) www.murata-ps.com/support MPM_DMS-CT.B05 Page 3 of 4 DMS Accessories 5 Amp AC Current Transformers NOTES Murata Power Solutions, Inc. ISO 9001 and 14001 REGISTERED This product is subject to the following operating requirements and the Life and Safety Critical Application Sales Policy: Refer to: http://www.murata-ps.com/requirements/ Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. (c) 2018 Murata Power Solutions, Inc. www.murata-ps.com/support MPM_DMS-CT.B05 Page 4 of 4 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Murata: 39-3681407 39-3681408 39-3681409 7020-01036-0 7020-01037-0 7020-01038-0 7020-01039-0 7020-01040-0 7020-01041-0 7020-01042-0 7020-01043-0 7020-01044-0 7020-01045-0 7020-01046-0