Revision history – Basler Electric BE1-81O/U User Manual
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9137300990 Rev N
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Revision History
Table 4 provides a historical summary of the changes made to this instruction manual. Revisions are 
listed in chronological order. 
Table 4. Instruction Manual Revision History
Manual
Revision and Date
Change
E, Mar-93
•
Various relay changes were incorporated into the manual
F, Apr-98
•
Revised paragraph styles
•
Section 1: Changed frequency sensing limits to 30 and 80 Hz and 
deleted paragraphs concerning revision levels. Modified power 
supply ranges. Changed pickup accuracy from 
±0.008 Hz to ±0.01
Hz. New statement was added to Isolation, added IEEE 
qualification statement, added UL recognition, corrected M1 case 
weight, and corrected Inverse Time Over/Underfrequency 
Characteristic Curve diagrams (Figures 1-2 and 1-3). 
•
Section 3: Added wide-range power supply data and deleted 
Figure 3-5. 
•
Section 4: Extracted testing and adjustment information and 
created new Section 5, Test and Adjustments. Incremented 
remaining section numbers as required. Inserted additional 
installation diagrams to cover all relay styles. 
G, Jun-99
•
Revised style chart to reflect changes to the E1 and E2 timing 
options 
•
Changed dielectric test specification listed in Sections 1 and 4
•
Figures 2-3 and 3-3 were updated to show the three-position 
Selector Switch S7 
•
All case drawings were updated to show revised case covers
•
Definite time delay options test procedures (Section 5) were 
modified to accommodate the new E1 and E2 timing options 
H, Sep-03
•
Removed references to timing option D1
I
•
This revision letter not used
J, Oct-07
•
Added manual part number and revision to all footers
•
Updated power supply burden data in Section 1
•
Updated output contact ratings in Section 1
•
Updated front-panel drawings to show LED targets
•
Updated target description in Section 3
K, Sep-10
•
Updated time delay accuracy in Section 1
•
Updated GOST-R statement in Section 1
•
Updated rear case drawings in Section 4
•
Updated Storage statement in Section 4
L, Sep-11
•
Added Figures 4-3, 4-6, 4-7, 4-10, and 4-11 for S1 single-ended 
case 
•
Removed Figure 4-9 for M1 single-ended case
M, Feb-13
•
Updated case and cover drawings in Section 4
N, Jun-14
•
Corrected truncated boxes in Figure 1, Style Chart
BE1-81O/U
Revision History
