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Brand: Basler Electric
Basler Electric BE1-11g Generator Protection System
Description
One relay for complete generator protection, from distributed sets to large units
The Basler Electric BE1-11g is a digital generator protection system that Basler designed to address reliability issues arising from the complexity of programming. BESTspace files, preprogrammed BESTlogicPlus schemes and application notes let engineers start from a proven protection scheme instead of building one from scratch, and the BE1-11 family shares one stable firmware package.
Basler describes it as one relay for most applications, from large power generation and distributed generation to backup generation and intertie protection, combining differential, stator ground, loss of excitation and out-of-step protection with metering and communications.
BE1-11g protection and automation functions
- Dual-slope differential protection with saturation detection algorithm
- 100 percent stator ground protection to help prevent expensive rewinds
- Loss of excitation and out-of-step (pole slip) protection; distance element backing up transmission faults
- Choice of built-in sync-check or auto synchronizer; frequency tracking for backup and cogeneration
- Device functions include 21, 24, 25, 27, 32, 40, 43, 46, 47, 50, 51, 59, 60, 62, 64G, 67, 78, 81, 86, 87 and 87N
- Front USB, rear RS-485, and Ethernet copper or fibre; BESTCOMSPlus, BESTnetPlus, Modbus, DNP and IEC 61850
- Offline Simulator in BESTlogicPlus; H1 drawout or J case with plug-out
BE1-11g technical specifications
Power supply and sensing
| Parameter | Specification |
|---|---|
| Phase voltage sensing (10 to 125 Hz) | Metering 50 to 250 Vac; continuous 300 V line-to-line; one-second 600 V line-to-neutral |
| Vx voltage sensing | Metering 25 to 125 Vac; continuous 150 V line-to-line; one-second 600 V line-to-neutral |
| 5 A nominal current (10 to 125 Hz) | Metering 0.5 to 15 Aac; continuous 20 Aac; one-second 400 Aac |
| 1 A nominal current | Metering 0.1 to 3 Aac; continuous 4 Aac; one-second 80 Aac |
| SEF current | Metering 0.01 to 3 Aac; continuous 4 Aac; one-second 80 Aac |
| Power supply option 1 | 48/125 Vac/dc; dc range 35 to 150 V, ac range 55 to 135 V |
| Power supply option 2 | 125/250 Vac/dc; dc range 90 to 300 V, ac range 90 to 270 V |
| Power supply option 3 | 24 Vdc; dc range 17 to 32 V (as low as 8 V for momentary dips) |
| Burden | 10 W continuous, 12 W maximum (all options) |
Communication, mechanical and approvals
| Parameter | Specification |
|---|---|
| Dimensions, H and P case (W x H x D) | 266.7 x 88.65 x 232.92 mm with flanges; 219.46 x 88.65 x 201.17 mm behind panel |
| Dimensions, J case (W x H x D) | 177.8 x 231.65 x 200.91 mm with flanges; 135.38 x 213.61 x 185.17 mm behind panel |
| I/O options (J case) | 10 inputs with 5 outputs, or 7 inputs with 8 outputs; H and P cases have 4 inputs and 5 outputs |
| Agency and certification | UL recognized, CSA certified per C22.2 No. 14, DNP3-2009 V2.6 compliant, KEMA certified per IEC 61850 Certificate Level A, CE and UKCA compliant, China RoHS compliant |
| USB / RS-485 | USB 2.0 Type-B / RS-485 up to 115,200 baud with DNP and Modbus |
| Ethernet | 10/100 Mbit copper, 100 Mbit fibre; BESTnetPlus, BESTCOMSPlus, DNP, Modbus, IEC 61850 |
| IP class | IP50 |
| Net weight | H1 rack mount (H case) 2.6 kg; H1 panel mount (P case) 2.8 kg; vertical case (J case) 2.3 kg |
Ordering code BE1-11 G E
| Parameter | Specification |
|---|---|
| Ethernet protocol | 0 none; 1 BESTnetPlus; 2 Modbus TCP; 3 DNP3; 4 Modbus TCP and DNP3; 5 IEC 61850 |
| Case | H H1 rack mount; J vertical case; P H1 panel mount |
| Power supply | 1 = 48/125 Vac/Vdc; 2 = 125/250 Vac/Vdc; 3 = 24 Vdc |
| Option 1 | N none; P current differential; S auto synchronizer; T synchronizer and differential |
| Phase current | 1 = 1 A; 5 = 5 A; 2 = dual 1 A; 6 = dual 5 A |
| Ground current | N none; A 5 A; B 1 A; C SEF; D dual 5 A; E dual 1 A; F SEF 5 A; G SEF 1 A |
| RS-485 protocol | N none; M Modbus; D DNP3 |
The ordering code rows summarize the style chart in the bulletin; the printed chart and its footnotes govern, for example J case is required for dual phase current, differential options and the 10-input I/O choices.
Specifying a BE1-11g
Begin with the current transformer secondaries (1 A or 5 A) and whether a differential option is needed, because the current differential option requires dual phase current inputs and the J case. Then choose the power supply (24, 48/125 or 125/250 V), the I/O set, SEF or dual ground inputs, and the communication protocols. IEC 61850 is Ethernet protocol option 5 and needs RS-485 set to none. Send the CT ratios and protocol list and we will map them to the style code.
Installation and settings notes
Pick the case for the mounting method: H1 rack, H1 panel, or the vertical J case with plug-out and additional I/O. Basler lists an escutcheon plate for two dovetailed H1 systems, a 19 inch rack adapter bracket, a bracket with cutout for an ABB FT test switch, and a test terminal block kit for J case systems. Settings are entered through the free BESTCOMSPlus software, with error checking and summary screens.
Where the BE1-11g is used
Typical uses are protecting gensets in cogeneration, captive power and utility plants and backup generators. The bulletin does not print a temperature range for this relay, so check the instruction manual for environmental limits.
Related Basler Electric items
Listed in the datasheet: BE1-FLEX protection, the BE1-64F ground fault relay for field windings, the DECS-250 excitation system and the DGC-2020HD genset controller, plus the mounting accessories above.
Related Basler Electric products: Basler Electric DECS-150 Digital Excitation Control System, Basler Electric AVC63-12 Analog Voltage Regulator, Basler Electric BE2000E Digital Voltage Regulator, Basler Electric DECS-250 Digital Excitation Control System, Basler Electric DECS-450 Digital Excitation Control System and Basler Electric DECS-250E Digital Excitation Control System.
Documents and quotation
Download the BE1-11g product bulletin (URJ-22, 09-26) from this page and read it alongside the manual when you verify the model code. Our quotation form takes the exact model, options and quantity, and Seven Star LLC, an independent Muscat supplier serving the GCC, replies with availability for Basler Electric equipment. No prices are listed; confirm all ratings, options and approvals against current manufacturer documents before ordering. Related pages: Circuit Breakers, Basler Electric.
Datasheets & Documents
- Datasheet Basler Electric BE1-11g product bulletin (URJ-22, 09-26) Download
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About brand
Basler Electric is an American maker of excitation, voltage regulation, generator control and protection products, founded in 1942 by Carl Basler in his father's garage in Highland, Illinois. Early work was rewinding and repairing electrical equipment, followed by custom transformers from 1945 and the SRA voltage regulator in 1959. Basler has plants in Highland, Taylor (Texas), Piedras Negras (Mexico) and Suzhou (China), and Littelfuse completed its acquisition of the company in December 2025.
Seven Star LLC is an independent supplier in Muscat. We list Basler Electric regulators and controllers for generator owners, packagers and power plants in Oman and the GCC.
Basler Electric company profile
| Founded | 1942, Highland, Illinois, USA, by Carl Basler |
|---|---|
| Headquarters | Highland, Illinois |
| Ownership | Littelfuse, since December 2025 |
| Manufacturing | Highland, Taylor (Texas), Piedras Negras (Mexico), Suzhou (China) |
| Product families | DECS-150, DECS-250, DECS-250E and DECS-450 digital excitation control systems, AVC and SR analog voltage regulators, DGC-2020 and DGC-2020HD genset controllers, BE1 protection relays, transformers |
Milestones
- 1942: Carl Basler starts the business in Highland.
- 1945: Custom transformer production begins.
- 1959: The SRA voltage regulator is introduced.
- 2025: Littelfuse completes the acquisition of Basler Electric.
Basler Electric product series
Digital excitation control systems include the DECS-150, DECS-250, DECS-250E and DECS-450, which regulate generator voltage, reactive power and power factor. Voltage regulators include the AVC63-4A and AVC63-12 analog regulators and the BE2000E digital regulator, common replacements on brushless generators.
The DGC-2020 and DGC-2020HD digital genset controllers handle engine start, metering, protection and paralleling, and the BE1-11g is a multifunction generator protection system.
Where Basler Electric controls are used
Stand-by and prime power gensets and larger synchronous generators and motors in oil and gas, petrochemical, power, water and construction projects across the Gulf.
Basler Electric products we list
Ordering Basler Electric parts: what we need
Send the full model and style code from the nameplate, the generator rating, voltage and excitation type, the control power supply and the existing regulator or controller being replaced. We match each request to the manufacturer bulletin before quoting.
Facts checked against Basler Electric's own company history page and Littelfuse's December 2025 announcement, October 2026.
Browse Basler Electric products by category: Diesel Generator Spare Parts.
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Frequently Asked Questions
What protection does the BE1-11g include?
Differential, 100 percent stator ground, loss of excitation, out of step, distance, sync-check and many more, as shown by the device function list.
Which protocols are supported?
Modbus and DNP over RS-485, and BESTnetPlus, Modbus TCP, DNP3 and IEC 61850 over Ethernet, subject to style code.
Is it IEC 61850 certified?
The datasheet states KEMA certification per IEC 61850 Certificate Level A.
What case styles exist?
H1 rack mount (H), H1 panel mount (P) and the vertical J case.
Is Seven Star LLC a Basler Electric distributor?
No. Seven Star LLC supplies Basler Electric products as an independent company in Muscat, Oman, and does not act as a manufacturer-appointed distributor.
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