|
|
按鈕開關 ILLIN.PB MOM.30MM FLAT AMBER
Eaton Electrical M30C-FDL-A
- M30C-FDL-A
- Eaton Electrical
-
1:
NT$3,402.72
-
暫無庫存
-
Mouser新產品
|
Mouser 元件編號
504-M30C-FDL-A
Mouser新產品
|
Eaton Electrical
|
按鈕開關 ILLIN.PB MOM.30MM FLAT AMBER
|
|
暫無庫存
|
|
|
NT$3,402.72
|
|
|
NT$3,047.04
|
|
|
NT$2,977.56
|
|
|
NT$2,910.60
|
|
|
檢視
|
|
|
NT$2,804.40
|
|
|
報價
|
|
最少： 1
倍數： 1
|
|
|
M30
|
Pushbutton Operators
|
|
Illuminated
|
Panel Mount
|
|
LED
|
Amber
|
Round, Flat
|
|
IP66, IP67, IP69K
|
Screw
|
Amber
|
|
|
|
|
按鈕開關 ILLUMIN.PUSHBUT. MOM.,30MM,AMBER,ETCHING
Eaton Electrical M30C-FDL-A-ETCH
- M30C-FDL-A-ETCH
- Eaton Electrical
-
1:
NT$4,790.88
-
暫無庫存
-
Mouser新產品
|
Mouser 元件編號
504-M30C-FDL-A-ETCH
Mouser新產品
|
Eaton Electrical
|
按鈕開關 ILLUMIN.PUSHBUT. MOM.,30MM,AMBER,ETCHING
|
|
暫無庫存
|
|
|
NT$4,790.88
|
|
|
NT$4,272.48
|
|
|
NT$4,174.56
|
|
|
NT$3,963.96
|
|
|
檢視
|
|
|
NT$3,939.12
|
|
|
報價
|
|
最少： 1
倍數： 1
|
|
|
M30
|
Pushbutton Operators
|
|
Illuminated
|
Panel Mount
|
|
LED
|
Amber
|
Round, Flat
|
|
IP66, IP67, IP69K
|
Screw
|
Amber
|
|
|
|
|
按鈕開關 ILLIN.PB MOM. 30MM FLAT BU
Eaton Electrical M30C-FDL-B
- M30C-FDL-B
- Eaton Electrical
-
1:
NT$3,517.92
-
暫無庫存
-
Mouser新產品
|
Mouser 元件編號
504-M30C-FDL-B
Mouser新產品
|
Eaton Electrical
|
按鈕開關 ILLIN.PB MOM. 30MM FLAT BU
|
|
暫無庫存
|
|
|
NT$3,517.92
|
|
|
NT$3,143.52
|
|
最少： 1
倍數： 1
|
|
|
M30
|
Bezels
|
Flush
|
Illuminated
|
Panel Mount
|
ON - (OFF)
|
|
|
|
|
IP67, IP69K
|
|
|
|
|
|
|
按鈕開關 ILLUMIN.PUSHBUT.MOM.,30MM,BLUE,ETCHING
Eaton Electrical M30C-FDL-B-ETCH
- M30C-FDL-B-ETCH
- Eaton Electrical
-
1:
NT$4,790.88
-
暫無庫存
-
Mouser新產品
|
Mouser 元件編號
504-M30C-FDL-B-ETCH
Mouser新產品
|
Eaton Electrical
|
按鈕開關 ILLUMIN.PUSHBUT.MOM.,30MM,BLUE,ETCHING
|
|
暫無庫存
|
|
|
NT$4,790.88
|
|
|
NT$4,272.48
|
|
|
NT$4,174.56
|
|
|
NT$3,963.96
|
|
|
檢視
|
|
|
NT$3,939.12
|
|
|
報價
|
|
最少： 1
倍數： 1
|
|
|
M30
|
Pushbutton Operators
|
|
Illuminated
|
Panel Mount
|
|
LED
|
Blue
|
Round, Flat
|
|
IP66, IP67, IP69K
|
Screw
|
Blue
|
|
|
|
|
按鈕開關 ILLIN.PUSHBUT.MOM 30MM FLAT FOR ETCHING
Eaton Electrical M30C-FDL-ETCH
- M30C-FDL-ETCH
- Eaton Electrical
-
1:
NT$4,790.88
-
暫無庫存
-
Mouser新產品
|
Mouser 元件編號
504-M30C-FDL-ETCH
Mouser新產品
|
Eaton Electrical
|
按鈕開關 ILLIN.PUSHBUT.MOM 30MM FLAT FOR ETCHING
|
|
暫無庫存
|
|
|
NT$4,790.88
|
|
|
NT$4,272.48
|
|
|
NT$4,174.56
|
|
|
NT$3,963.96
|
|
|
檢視
|
|
|
NT$3,939.12
|
|
|
報價
|
|
最少： 1
倍數： 1
|
|
|
M30
|
Pushbutton Operators
|
|
Illuminated
|
Panel Mount
|
|
LED
|
|
Round, Flat
|
|
IP66, IP67, IP69K
|
Screw
|
|
|
|
|
|
按鈕開關 ILLIN.PB MOM. 30MM FLATGN
Eaton Electrical M30C-FDL-G
- M30C-FDL-G
- Eaton Electrical
-
1:
NT$3,517.92
-
暫無庫存
-
Mouser新產品
|
Mouser 元件編號
504-M30C-FDL-G
Mouser新產品
|
Eaton Electrical
|
按鈕開關 ILLIN.PB MOM. 30MM FLATGN
|
|
暫無庫存
|
|
|
NT$3,517.92
|
|
|
NT$3,143.52
|
|
最少： 1
倍數： 1
|
|
|
M30
|
Bezels
|
Flush
|
Illuminated
|
Panel Mount
|
ON - (OFF)
|
|
|
|
|
IP67, IP69K
|
|
|
|
|
|
|
按鈕開關 ILLUMIN.PUSHBUT.MOM.,30MM,GREEN,ETCHING
Eaton Electrical M30C-FDL-G-ETCH
- M30C-FDL-G-ETCH
- Eaton Electrical
-
1:
NT$4,790.88
-
暫無庫存
-
Mouser新產品
|
Mouser 元件編號
504-M30C-FDL-G-ETCH
Mouser新產品
|
Eaton Electrical
|
按鈕開關 ILLUMIN.PUSHBUT.MOM.,30MM,GREEN,ETCHING
|
|
暫無庫存
|
|
|
NT$4,790.88
|
|
|
NT$4,272.48
|
|
|
NT$4,174.56
|
|
|
NT$3,963.96
|
|
|
檢視
|
|
|
NT$3,939.12
|
|
|
報價
|
|
最少： 1
倍數： 1
|
|
|
M30
|
Pushbutton Operators
|
|
Illuminated
|
Panel Mount
|
|
LED
|
Green
|
Round, Flat
|
|
IP66, IP67, IP69K
|
Screw
|
Green
|
|
|
|
|
按鈕開關 ILLUMIN.PUSHBUT.MOM.30MM FLAT, GREEN "I"
Eaton Electrical M30C-FDL-G-X1
- M30C-FDL-G-X1
- Eaton Electrical
-
1:
NT$3,744.00
-
暫無庫存
-
Mouser新產品
|
Mouser 元件編號
504-M30C-FDL-G-X1
Mouser新產品
|
Eaton Electrical
|
按鈕開關 ILLUMIN.PUSHBUT.MOM.30MM FLAT, GREEN "I"
|
|
暫無庫存
|
|
|
NT$3,744.00
|
|
|
NT$3,347.28
|
|
最少： 1
倍數： 1
|
|
|
M30
|
Bezels
|
Flush
|
Illuminated
|
Panel Mount
|
ON - (OFF)
|
|
|
|
|
IP67, IP69K
|
|
|
|
|
|
|
按鈕開關 ILLUMIN.PUSHBUT.MOM.30MM FLAT,GREEN X32
Eaton Electrical M30C-FDL-G-X32
- M30C-FDL-G-X32
- Eaton Electrical
-
1:
NT$4,550.04
-
暫無庫存
-
Mouser新產品
|
Mouser 元件編號
504-M30C-FDL-G-X32
Mouser新產品
|
Eaton Electrical
|
按鈕開關 ILLUMIN.PUSHBUT.MOM.30MM FLAT,GREEN X32
|
|
暫無庫存
|
|
|
NT$4,550.04
|
|
|
NT$4,026.60
|
|
|
NT$3,934.44
|
|
|
NT$3,746.88
|
|
|
檢視
|
|
|
NT$3,630.60
|
|
|
報價
|
|
最少： 1
倍數： 1
|
|
|
M30
|
Pushbutton Operators
|
|
Illuminated
|
Panel Mount
|
|
LED
|
Green
|
Round, Flat
|
|
IP66, IP67, IP69K
|
Screw
|
Green
|
|
|
|
|
按鈕開關 ILLUMIN.PUSHBUT. MOM.,30MM,RED,ETCHING
Eaton Electrical M30C-FDL-R-ETCH
- M30C-FDL-R-ETCH
- Eaton Electrical
-
1:
NT$4,790.88
-
暫無庫存
-
Mouser新產品
|
Mouser 元件編號
504-M30C-FDL-R-ETCH
Mouser新產品
|
Eaton Electrical
|
按鈕開關 ILLUMIN.PUSHBUT. MOM.,30MM,RED,ETCHING
|
|
暫無庫存
|
|
|
NT$4,790.88
|
|
|
NT$4,272.48
|
|
|
NT$4,174.56
|
|
|
NT$3,963.96
|
|
|
檢視
|
|
|
NT$3,939.12
|
|
|
報價
|
|
最少： 1
倍數： 1
|
|
|
M30
|
Pushbutton Operators
|
|
Illuminated
|
Panel Mount
|
|
LED
|
Red
|
Round, Flat
|
|
IP66, IP67, IP69K
|
Screw
|
Red
|
|
|
|
|
按鈕開關 ILLIN.PB MOM. 30MM FLATRD "O"
Eaton Electrical M30C-FDL-R-X0
- M30C-FDL-R-X0
- Eaton Electrical
-
1:
NT$3,744.00
-
暫無庫存
-
Mouser新產品
|
Mouser 元件編號
504-M30C-FDL-R-X0
Mouser新產品
|
Eaton Electrical
|
按鈕開關 ILLIN.PB MOM. 30MM FLATRD "O"
|
|
暫無庫存
|
|
|
NT$3,744.00
|
|
|
NT$3,347.28
|
|
最少： 1
倍數： 1
|
|
|
M30
|
Bezels
|
Flush
|
Illuminated
|
Panel Mount
|
ON - (OFF)
|
|
|
|
|
IP67, IP69K
|
|
|
|
|
|
|
按鈕開關 ILLIN.PB MOM. 30MM FLATWHITE
Eaton Electrical M30C-FDL-W
- M30C-FDL-W
- Eaton Electrical
-
1:
NT$3,831.48
-
暫無庫存
-
Mouser新產品
|
Mouser 元件編號
504-M30C-FDL-W
Mouser新產品
|
Eaton Electrical
|
按鈕開關 ILLIN.PB MOM. 30MM FLATWHITE
|
|
暫無庫存
|
|
|
NT$3,831.48
|
|
|
NT$3,430.08
|
|
|
NT$3,364.92
|
|
|
NT$3,270.24
|
|
|
檢視
|
|
|
NT$3,187.44
|
|
|
報價
|
|
最少： 1
倍數： 1
|
|
|
M30
|
Pushbutton Operators
|
|
Illuminated
|
Panel Mount
|
|
LED
|
White
|
Round, Flat
|
|
IP66, IP67, IP69K
|
Screw
|
White
|
|
|
|
|
按鈕開關 ILLUMIN.PUSHBUT. MOM.,30MM,WHITE,ETCHING
Eaton Electrical M30C-FDL-W-ETCH
- M30C-FDL-W-ETCH
- Eaton Electrical
-
1:
NT$4,790.88
-
暫無庫存
-
Mouser新產品
|
Mouser 元件編號
504-M30C-FDL-W-ETCH
Mouser新產品
|
Eaton Electrical
|
按鈕開關 ILLUMIN.PUSHBUT. MOM.,30MM,WHITE,ETCHING
|
|
暫無庫存
|
|
|
NT$4,790.88
|
|
|
NT$4,272.48
|
|
|
NT$4,174.56
|
|
|
NT$3,963.96
|
|
|
檢視
|
|
|
NT$3,939.12
|
|
|
報價
|
|
最少： 1
倍數： 1
|
|
|
M30
|
Pushbutton Operators
|
|
Illuminated
|
Panel Mount
|
|
LED
|
White
|
Round, Flat
|
|
IP66, IP67, IP69K
|
Screw
|
White
|
|
|
|
|
按鈕開關 ILLUMIN.PUSHB.MOM. 30MM FLAT, WHITE "O"
Eaton Electrical M30C-FDL-W-X0
- M30C-FDL-W-X0
- Eaton Electrical
-
1:
NT$4,159.08
-
暫無庫存
-
Mouser新產品
|
Mouser 元件編號
504-M30C-FDL-W-X0
Mouser新產品
|
Eaton Electrical
|
按鈕開關 ILLUMIN.PUSHB.MOM. 30MM FLAT, WHITE "O"
|
|
暫無庫存
|
|
|
NT$4,159.08
|
|
|
NT$3,759.12
|
|
|
NT$3,667.32
|
|
|
NT$3,526.56
|
|
|
檢視
|
|
|
NT$3,439.44
|
|
|
報價
|
|
最少： 1
倍數： 1
|
|
|
M30
|
Pushbutton Operators
|
|
Illuminated
|
Panel Mount
|
|
LED
|
White
|
Round, Flat
|
|
IP66, IP67, IP69K
|
Screw
|
White
|
|
|
|
|
按鈕開關 ILLUMIN.PUSHB.MOM. 30MM FLAT, WHITE "I"
Eaton Electrical M30C-FDL-W-X1
- M30C-FDL-W-X1
- Eaton Electrical
-
1:
NT$4,586.40
-
暫無庫存
-
Mouser新產品
|
Mouser 元件編號
504-M30C-FDL-W-X1
Mouser新產品
|
Eaton Electrical
|
按鈕開關 ILLUMIN.PUSHB.MOM. 30MM FLAT, WHITE "I"
|
|
暫無庫存
|
|
|
NT$4,586.40
|
|
|
NT$4,060.08
|
|
|
NT$3,967.92
|
|
|
NT$3,779.28
|
|
|
檢視
|
|
|
NT$3,662.28
|
|
|
報價
|
|
最少： 1
倍數： 1
|
|
|
M30
|
Pushbutton Operators
|
|
Illuminated
|
Panel Mount
|
|
LED
|
White
|
Round, Flat
|
|
IP66, IP67, IP69K
|
Screw
|
White
|
|
|
|
|
按鈕開關 ILLUMIN.PUSHBUT.MOM.30MM FLAT,WHITE X100
Eaton Electrical M30C-FDL-W-X100
- M30C-FDL-W-X100
- Eaton Electrical
-
1:
NT$4,550.04
-
暫無庫存
-
Mouser新產品
|
Mouser 元件編號
504-M30C-FDL-W-X100
Mouser新產品
|
Eaton Electrical
|
按鈕開關 ILLUMIN.PUSHBUT.MOM.30MM FLAT,WHITE X100
|
|
暫無庫存
|
|
|
NT$4,550.04
|
|
|
NT$4,026.60
|
|
|
NT$3,934.44
|
|
|
NT$3,746.88
|
|
|
檢視
|
|
|
NT$3,630.60
|
|
|
報價
|
|
最少： 1
倍數： 1
|
|
|
M30
|
Pushbutton Operators
|
|
Illuminated
|
Panel Mount
|
|
LED
|
|
Round, Flat
|
|
IP66, IP67, IP69K
|
Screw
|
White
|
|
|
|
|
按鈕開關 ILLUMIN.PUSHBUT.MOM.30MM FLAT W/O LENS
Eaton Electrical M30C-FDL-X
- M30C-FDL-X
- Eaton Electrical
-
1:
NT$4,018.68
-
暫無庫存
-
Mouser新產品
|
Mouser 元件編號
504-M30C-FDL-X
Mouser新產品
|
Eaton Electrical
|
按鈕開關 ILLUMIN.PUSHBUT.MOM.30MM FLAT W/O LENS
|
|
暫無庫存
|
|
|
NT$4,018.68
|
|
|
NT$3,554.28
|
|
|
NT$3,454.56
|
|
|
NT$3,308.76
|
|
|
檢視
|
|
|
NT$3,205.80
|
|
|
報價
|
|
最少： 1
倍數： 1
|
|
|
M30
|
Pushbutton Operators
|
|
Illuminated
|
Panel Mount
|
|
LED
|
|
Round, Flat
|
|
IP66, IP67, IP69K
|
Screw
|
|
|
|
|
|
按鈕開關 ILLUMIN.PUSHBUT.MOM.30MM,YELLOW,ETCHING
Eaton Electrical M30C-FDL-Y-ETCH
- M30C-FDL-Y-ETCH
- Eaton Electrical
-
1:
NT$4,790.88
-
暫無庫存
-
Mouser新產品
|
Mouser 元件編號
504-M30C-FDL-Y-ETCH
Mouser新產品
|
Eaton Electrical
|
按鈕開關 ILLUMIN.PUSHBUT.MOM.30MM,YELLOW,ETCHING
|
|
暫無庫存
|
|
|
NT$4,790.88
|
|
|
NT$4,272.48
|
|
|
NT$4,174.56
|
|
|
NT$3,963.96
|
|
|
檢視
|
|
|
NT$3,939.12
|
|
|
報價
|
|
最少： 1
倍數： 1
|
|
|
M30
|
Pushbutton Operators
|
|
Illuminated
|
Panel Mount
|
|
LED
|
Yellow
|
Round, Flat
|
|
IP66, IP67, IP69K
|
Screw
|
Yellow
|
|
|
|
|
按鈕開關 ILLUMIN.PUSHBUT.MOM.30MM FLAT,YEL.X162
Eaton Electrical M30C-FDL-Y-X162
- M30C-FDL-Y-X162
- Eaton Electrical
-
1:
NT$4,586.40
-
暫無庫存
-
Mouser新產品
|
Mouser 元件編號
504-M30C-FDL-Y-X162
Mouser新產品
|
Eaton Electrical
|
按鈕開關 ILLUMIN.PUSHBUT.MOM.30MM FLAT,YEL.X162
|
|
暫無庫存
|
|
|
NT$4,586.40
|
|
|
NT$4,060.08
|
|
|
NT$3,967.92
|
|
|
NT$3,779.28
|
|
|
檢視
|
|
|
NT$3,662.28
|
|
|
報價
|
|
最少： 1
倍數： 1
|
|
|
M30
|
Pushbutton Operators
|
|
Illuminated
|
Panel Mount
|
|
LED
|
Yellow
|
Round, Flat
|
|
IP66, IP67, IP69K
|
Screw
|
Yellow
|
|
|
|
|
按鈕開關 PUSHBUTTON, 30MM FLAT, BLUE, MAINT.
Eaton Electrical M30C-FDR-B
- M30C-FDR-B
- Eaton Electrical
-
1:
NT$4,204.44
-
暫無庫存
-
Mouser新產品
|
Mouser 元件編號
504-M30C-FDR-B
Mouser新產品
|
Eaton Electrical
|
按鈕開關 PUSHBUTTON, 30MM FLAT, BLUE, MAINT.
|
|
暫無庫存
|
|
|
NT$4,204.44
|
|
|
NT$3,765.60
|
|
|
NT$3,694.68
|
|
|
NT$3,551.04
|
|
|
檢視
|
|
|
NT$3,461.76
|
|
|
報價
|
|
最少： 1
倍數： 1
|
|
|
M30
|
Pushbutton Operators
|
|
Non-Illuminated
|
Panel Mount
|
|
|
|
Round, Flat
|
|
IP66, IP67, IP69K
|
Screw
|
Blue
|
|
|
|
|
按鈕開關 PUSHBUTTON MAINT.,30MM FLAT,BLUE,ETCHING
Eaton Electrical M30C-FDR-B-ETCH
- M30C-FDR-B-ETCH
- Eaton Electrical
-
1:
NT$4,515.48
-
暫無庫存
-
Mouser新產品
|
Mouser 元件編號
504-M30C-FDR-B-ETCH
Mouser新產品
|
Eaton Electrical
|
按鈕開關 PUSHBUTTON MAINT.,30MM FLAT,BLUE,ETCHING
|
|
暫無庫存
|
|
|
NT$4,515.48
|
|
|
NT$3,996.00
|
|
|
NT$3,904.56
|
|
|
NT$3,718.44
|
|
|
檢視
|
|
|
NT$3,602.88
|
|
|
報價
|
|
最少： 1
倍數： 1
|
|
|
M30
|
Pushbutton Operators
|
|
Non-Illuminated
|
Panel Mount
|
|
|
|
Round, Flat
|
|
IP66, IP67, IP69K
|
Screw
|
Blue
|
|
|
|
|
按鈕開關 PUSHBUTTON, 30MM FLAT, GREEN, MAINT.
Eaton Electrical M30C-FDR-G
- M30C-FDR-G
- Eaton Electrical
-
1:
NT$4,145.76
-
暫無庫存
-
Mouser新產品
|
Mouser 元件編號
504-M30C-FDR-G
Mouser新產品
|
Eaton Electrical
|
按鈕開關 PUSHBUTTON, 30MM FLAT, GREEN, MAINT.
|
|
暫無庫存
|
|
|
NT$4,145.76
|
|
|
NT$3,710.16
|
|
|
NT$3,646.08
|
|
|
NT$3,509.28
|
|
|
NT$3,423.96
|
|
最少： 1
倍數： 1
|
|
|
M30
|
Pushbutton Operators
|
|
Non-Illuminated
|
Panel Mount
|
|
|
|
Round, Flat
|
|
IP66, IP67, IP69K
|
Screw
|
Green
|
|
|
|
|
按鈕開關 PUSHBUT. MAINT.,30MM FLAT,GREEN,ETCHING
Eaton Electrical M30C-FDR-G-ETCH
- M30C-FDR-G-ETCH
- Eaton Electrical
-
1:
NT$4,515.48
-
暫無庫存
-
Mouser新產品
|
Mouser 元件編號
504-M30C-FDR-G-ETCH
Mouser新產品
|
Eaton Electrical
|
按鈕開關 PUSHBUT. MAINT.,30MM FLAT,GREEN,ETCHING
|
|
暫無庫存
|
|
|
NT$4,515.48
|
|
|
NT$3,996.00
|
|
|
NT$3,904.56
|
|
|
NT$3,718.44
|
|
|
檢視
|
|
|
NT$3,602.88
|
|
|
報價
|
|
最少： 1
倍數： 1
|
|
|
M30
|
Pushbutton Operators
|
|
Non-Illuminated
|
Panel Mount
|
|
|
|
Round, Flat
|
|
IP66, IP67, IP69K
|
Screw
|
Green
|
|
|
|
|
按鈕開關 PUSHBUTTON, 30MM FLAT, GREEN,MAINT."I"
Eaton Electrical M30C-FDR-G-X1
- M30C-FDR-G-X1
- Eaton Electrical
-
1:
NT$4,864.32
-
暫無庫存
-
Mouser新產品
|
Mouser 元件編號
504-M30C-FDR-G-X1
Mouser新產品
|
Eaton Electrical
|
按鈕開關 PUSHBUTTON, 30MM FLAT, GREEN,MAINT."I"
|
|
暫無庫存
|
|
|
NT$4,864.32
|
|
|
NT$4,339.08
|
|
|
NT$4,240.80
|
|
|
NT$4,027.68
|
|
|
檢視
|
|
|
NT$4,001.76
|
|
|
報價
|
|
最少： 1
倍數： 1
|
|
|
M30
|
Pushbutton Operators
|
|
Non-Illuminated
|
Panel Mount
|
|
|
|
Round, Flat
|
|
IP66, IP67, IP69K
|
Screw
|
Green
|
|
|
|
|
按鈕開關 PUSHBUTTON, 30MM FLAT, RED, MAINT.
Eaton Electrical M30C-FDR-R
- M30C-FDR-R
- Eaton Electrical
-
1:
NT$4,204.44
-
暫無庫存
-
Mouser新產品
|
Mouser 元件編號
504-M30C-FDR-R
Mouser新產品
|
Eaton Electrical
|
按鈕開關 PUSHBUTTON, 30MM FLAT, RED, MAINT.
|
|
暫無庫存
|
|
|
NT$4,204.44
|
|
|
NT$3,765.60
|
|
|
NT$3,694.68
|
|
|
NT$3,551.04
|
|
|
檢視
|
|
|
NT$3,461.76
|
|
|
報價
|
|
最少： 1
倍數： 1
|
|
|
M30
|
Pushbutton Operators
|
|
Non-Illuminated
|
Panel Mount
|
|
|
|
Round, Flat
|
|
IP66, IP67, IP69K
|
Screw
|
Red
|
|
|
臺灣