Accessories for R901125561

PRESSURE SWITCH HED 8 OA-2X/350K35

Manufacturer: Bosch Rexroth

Material #: R901125561

Model : HED 8 OA-2X/350K35

***Disclaimer: The following summary contains information gathered from various sources such as product descriptions, technical specifications and catalogs. While efforts have been made to provide accurate details, inaccuracies may occur. It is advised to verify all information by contacting Bosch Rexroth directly.***
The Bosch Rexroth HED 8 OA-2X/350K35 (R901125561) is a high-precision hydraulic pressure switch designed for robust performance in various hydraulic applications. This piston type pressure switch is engineered to monitor and regulate pressure with exceptional accuracy and repeatability. It features a micro switch with NC (normally closed)/NO (normally open) contact function, enabling potential-free switching of currents from mA to 0.5A, which makes it suitable for diverse electrical circuit setups. The HED 8 OA-2X/350K35 is built to withstand a maximum operating pressure of 350 bar and offers various pressure ratings including 50, 100, 200, and 315 bar. The device connector conforms to DIN EN standards with a large cubic design and an M12 x 1 A-coded connector ensuring secure and reliable electrical connections. Its construction includes NBR seals that are compatible with hydraulic fluids such as HL, HLP, HLPD, HVLP, and HVLPD. This model boasts high repetition accuracy of less than ±2% of the set pressure value along with a small hysteresis that varies depending on the set switching point. The adjustment type for this pressure switch is a spindle with an internal hexagon that facilitates fine-tuning without the need for a scale or protective cap. The product complies with CCC and UL certifications, meeting stringent safety standards while also adhering to RoHS environmental regulations. It is suitable for pipeline installation or can be used as part of a flange connection according to ISO standards. Applications of the HED 8 OA-2X/350K35 are versatile as it can be utilized in subplate mounting/pipeline installation or as part of vertical stacking elements in conjunction with sandwich plates following ISO standards. Users can benefit from its durability and precision in controlling hydraulic systems within industrial environments where accurate pressure monitoring is critical.

$558.00 USD

More are expected on May 20, 2025

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PRESSURE SWITCH HED 8 OA-2X/350K35

350 bar, micro switch with NC contact/NO contact function, device connector DIN EN 175301-803 (large cubic connector)

Potential-free switching of currents from 1 mA to 2.0 A. Small hysteresis, depending on the set switching point. High repetition accuracy < 1% of the set pressure

Unpacked Weight: 0.72 kg

For subplate mounting/pipeline installation For flange connection according to ISO 16873 As vertical stacking element in connection with sandwich plates according to ISO 4401 5 pressure ratings 4 adjustment types:– Spindle with/without protective cap– Spindle with scale, with/without protective cap– Rotary knob with scale– Lockable rotary knob with scale Electrical connection– with valve plug-in connector design A (large cubic connector)– with M12 x 1 connector Micro switch with NC/NO contact function Potential-free switching of currents from 1 mA to 2 A UL approval for pressure ranges up to 350 bar

The hydro-electric pressure switch type HED 8 is a piston type pressure switch. It basically comprises of housing (1), installation kit with piston (2), compression spring (3), adjustment element (4) and micro switch (5).

If the pressure to be monitored is below the set value, the micro switch (5) is operated. The pressure to be monitored is applied via the nozzle (7) at the piston (2). The piston (2) is supported by the spring plate (6) and acts against the continuously adjustable force of the compression spring (3). The spring plate (6) transmits the movement of the piston (2) onto the micro switch (5) and releases the latter when the set pressure is reached. This switches the electric circuit on or off, depending on the circuit set-up. The mechanical positive stop of the spring plate (6) protects the micro switch (5) in case of a sudden pressure drop from mechanical destruction and, in case of overpressure, prevents solid compression of the compression spring (3).

Notices:

In order to increase the life cycle, the pressure switch should be mounted with low vibrations and protected from hydraulic pressure surges.

Type HED 8 OH-2X/…K14
Type HED 8 OH-2X/…K14S

Type HED 8 OP-2X/…K14A
Type HED 8 OP-2X/…K14AS

Type HED 8 OA-2X/…K14KW
Type HED 8 OA-2X/…K14KS

With NBR seals
Piston type pressure switch
Micro switch with NC contact/NO contact function
Pipeline installation
Without mating connector, connector DIN EN 175301-803
Internal hexagon
Pressure ratings 50, 100, 200, 350 and 630 bar
Component series 2X
Maximum operating pressure 630 bar
UL recognized component, CCC-certified

Data Sheet	Download Data Sheet
Manual	Download Manual
Manual	Download Manual
Manual	Download Manual
Manual	Download Manual
Manual	Download Manual

Max. pressure	350
Electrical connection description	Connector, 4-pole, M12 x 1, coding A according to EN 61076-2-101
Productgroup ID	9,10,11,12,13,14
Type of connection	Pipeline
Connection diagram	Internal thread G1/4
Supply voltage	12...48 V AC/DC
Weight	0.72
Seals	NBR
Output signal	Micro switch with normally closed contact/NO contact function
Hydraulic fluid	HL,HLP,HLPD,HVLP,HVLPD
Conformity	CCC,UL,RoHS

01	Piston type pressure switch	HED8
02	Flange connection (ISO 16873) 1)	OH
	Subplate mounting	OP
	Pipeline installation	OA
03	Component series 60 … 69 (60 … 69: unchanged installation and connection dimensions)	2X
04	Pressure rating maximum 50 bar	50
	Pressure rating maximum 100 bar	100
	Pressure rating maximum 200 bar	200
	Pressure rating maximum 350 bar	350
	Pressure rating maximum 630 bar	630
Electrical connection
05	Individual connection
	Without mating connector; connector DIN EN 175301-803	K14 3)
	Without mating connector, 4-pole with connector M12x1, integrated interference protection circuit, status LED according to IEC 60947-5-2	K35 3)
Adjustment type
06	Spindle with internal hexagon, without scale, without protective cap	no code
	Spindle with internal hexagon, without scale, with protective cap, sealable	S
	Spindle with scale, without protective cap	A5)
	Spindle with scale, with protective cap	AS5)
	Lockable rotary knob with scale	KS4; 5)
	Rotary knob with scale	KW 5)
Seal material
07	NBR seals	no code
	FKM seals	V
	Low-temperature seals (max. 315 bar)	MT
	Observe compatibility of seals with hydraulic fluid used. (Other seals upon request)
08	Further details in the plain text

	1) Sandwich plate for vertical stacking, separate order see accessories
	2) Not admissible for vertical stacking, not with low-temperature seals, without UL approval
	3) Mating connectors, separate order, see accessories
	4) H-key, material no. R900008158, is included in the scope of delivery
	5) Exact setting of the switching pressure is only possible by means of a pressure gauge (scale only serves as orientation)

Type

Component series		2X

General

Weight		m	kg	0.8
Installation position				any
Ambient temperature ranges (NBR seals)		ϑ	°C	-25 … +50
Ambient temperature ranges (FKM seals)		ϑ	°C	-20 … +50
Ambient temperature range (low-temperature seal)		ϑ	°C	-40 … +50
Sine test				DIN EN 60068-2-6:1996-05: 10…2000 Hz / max. 10 g / 10 double cycles
Transport shock				DIN EN 60068-2-27:1995-03: 15 g / 11 ms
Bump test				DIN EN 60068-2-29:1995-03: 25 g / 6 ms
Noise test				DIN EN 60068-2-64:1996-05: 20…2000 Hz / 10 g RMS / 30 min
Conformity/certification	CE			DIN EN 61058-1: 2002 / A2: 2008 DIN EN 60947-1: 2007 / A1: 2011 DIN EN 60947-5-1: 2004 / A1: 2009 DIN EN 60529: 1991 / A2: 2013
	UL			UL, 508 17th edition File No E223220 (up to 350 bar)
	CCC			GB 14048.5-2008
	RoHS			Compliant according to EU directive 2011/65/EU

Hydraulisch

Pressure rating	p	bar	50	100	200	350	630
Operating pressure NBR/FKM seals, max.	p	bar	350			400	630
Pressure adjustment range (decreasing)	p	bar	5 … 50	10 … 100	15 … 200	25 … 350	40 … 630
Pressure differential per rotation 1)	p	bar	≈ 19	≈ 35	≈ 77	≈ 120	≈ 214
Hydraulic fluid 1)			see table below
Hydraulic fluid temperature range (NBR seals)	ϑ	°C	-25 … +80
Hydraulic fluid temperature range (FKM seals)	ϑ	°C	-20 … +80
Hydraulic fluid temperature range (low-temperature seals)	ϑ	°C	-40 … +80
Viscosity range	μ	mm²/s	10 … 800
Maximum admissible degree of contamination of the hydraulic fluid 2)			Class 20/18/15 according to ISO 4406 (c)
Load cycles			≥ 5 million

1)	Direction of rotation: clockwise → Set pressure increase counterclockwise → Set pressure decrease
2)	The cleanliness classes specified for the components must be adhered to in hydraulic systems. Effective filtration prevents faults and simultaneously increases the life cycle of the components. For the selection of the filters, see www.boschrexroth.com/filter.

Hydraulic fluid		Classification	Suitable sealing materials	Standards
Mineral oils and related hydrocarbons		HL, HLP	NBR, FKM	DIN 51524
Mineral oils and related hydrocarbons		HVLP	Low-temperature design MT
Bio-degradable	Insoluble in water	HETG	NBR, FKM	ISO 15380
	Insoluble in water	HEES	FKM	ISO 15380
	Soluble in water	HEPG	FKM	ISO 15380
Flame-resistant	Containing water	HFC	NBR	ISO 12922
Important information on hydraulic fluids! Further information and information on the use of other hydraulic fluids on request!

Elektrisch

Anschlussart	With connector "K14"			EN 175301-803, 3-pole + PE
Anschlussart	With connector "K35"			IEC 61076-2-101, M12 x 1, A coding, 4-pole
Protection class according to DIN EN 60529	With connector "K14"			IP65 with mating connector mounted and fitted
Protection class according to DIN EN 60529	With connector "K35"			IP 67 with mating connector mounted and fitted
Switching frequency, max.			1/h	7200
Switching accuracy (repetition accuracy)				< 1 % of the set pressure
Switch				according to VDE 0630-1/DIN EN 61058-1
Transition resistance		R	mΩ	< 50
Insulation coordination				Überspannung Kategorie 3
Contamination				Degree of contamination 3
Bounce time	On	t	ms	< 5
Bounce time	Off	t	ms	< 5
Current, min.		I	mA	1.0 with 24 V DC
Current, max.	With connector "K14"	I	A	0.5 with 50 V DC, inductive 0.2 with 125 V DC, inductive 0.1 with 250 V DC, inductive 2.0 with 250 V AC
Current, max.	With connector "K35"	I	A	0.5 with 48 V DC, inductive 2.0 with 48 V DC, ohmic load

Switching power
Switching cycles	Voltage U in V	Ohmic load max. in A	Inductive load, max. in A
With connector "K14"
2 million	250, AC	2 A for 2 million switching cycles (AC-12)	0.5 A, cos. ϕ = 0.6 for 2 million switching cycles (DC-12)
With connector “K14” and “K35”
2 million	24, DC	2 A for 2 million switching cycles (AC-12)	0.5 A for 2 million switching cycles 3)
5 million	24, DC	5.0 mA for 5 million switching cycles (DC-12)	‒

For applications outside these parameters, please consult us!

Switching pressure differential (measured with HLP46, ϑOil = 40 ±5 °C)

Pressure rating 50 bar

Pressure rating 100 bar

Pressure rating 200 bar

Pressure rating 350 bar

Pressure rating 630 bar

Notices:

The switching pressure differential may increase within the course of the life cycle due to the deterioration of the oil quality and the number of load cycles.

"K14" without indicator light	"K14" with indicator light	"K35"

Switching function Terminals 1-2: In case of pressure increase, contact opens Terminals 1-3: In case of pressure increase, contact closes		Switching function Terminals 1-2: In case of pressure increase, contact opens Terminals 1-4: In case of pressure increase, contact closes

Notice:

For general information on safety, installation or commissioning, see operating instructions.

Type HED 8 …K14

Dimensions in mm

1	Adjustment type "KW"
2	Adjustment type "KS"
3	Adjustment type "–"
4	Adjustment type "S"
5	Adjustment type "A"
6	Adjustment type "AS"
7	Seal ring
8	Space required to remove the key
9	Space required to remove the mating connector
10	Hexagon SW27 (with adjustment type "KS")
11	Internal hexagon SW10
12	Mating connector without circuitry for connection "K14” (separate order)
13	Mating connector with circuitry for connection "K14” (separate order)
17	Valve mounting screws (separate order) for type HED 8 OH… 2 hexagon socket head cap screws, metric ISO 4762 - M5 x 55 - 10.9-flZn-240h-L Friction coefficient μtotal = 0.09 to 0.14, Tightening torque MA = 6+0.5 Nm, Material no. R913000261
18	Maximum diameter of the connection bore of the counterpart (type HED 8 OH…)
19	Maximum diameter of the connection bore of the counterpart (type HED 8 OP…)
20	Valve mounting screws (separate order) for type HED 8 OA… and …OP… 2 hexagon socket head cap screws, metric ISO 4762 - M5 x 50 - 10.9-flZn-240h-L Friction coefficient μtotal = 0.09 to 0.14, Tightening torque MA = 7+0.5 Nm, Material no. R913000064

Type HED 8 …K35

Dimensions in mm

1	Adjustment type "KW"
2	Adjustment type "KS"
3	Adjustment type "–"
4	Adjustment type "S"
5	Adjustment type "A"
6	Adjustment type "AS"
7	Seal ring
8	Space required to remove the key
9	Space required to remove the mating connector
10	Hexagon SW27 (with adjustment type "KS")
11	Internal hexagon SW10
14	Mating connector for connection "K35" (separate order)
15	Mating connector suitable for "K35", angled (separate order)
16	Mating connector for connection "K35", with cable (separate order)
17	Valve mounting screws (separate order) for type HED 8 OH… 2 hexagon socket head cap screws, metric ISO 4762 - M5 x 55 - 10.9-flZn-240h-L Friction coefficient μtotal = 0.09 to 0.14, Tightening torque MA = 6+0.5 Nm, Material no. R913000261
18	Maximum diameter of the connection bore of the counterpart (type HED 8 OH…)
19	Maximum diameter of the connection bore of the counterpart (type HED 8 OP…)
20	Valve mounting screws (separate order) for type HED 8 OA… and …OP… 2 hexagon socket head cap screws, metric ISO 4762 - M5 x 50 - 10.9-flZn-240h-L Friction coefficient μtotal = 0.09 to 0.14, Tightening torque MA = 7+0.5 Nm, Material no. R913000064

Type HED 8 OH… in vertical stacking NG6

1	Pressure switch HED 8 OH… for use in stacking assemblies (can be assembled staggered by 4 x 90°) The mounting option of the pressure switch depends on the set-up of the next stacking assembly subplate.
2	Sandwich plate type HSZ 06A... for use of the pressure switch as stacking element
3	Space required to remove the key
4	Space required to remove the mating connector

Mating connector	H1	H2	H3
Port “K14”, without circuitry	87	65	15
Port “K14”, with circuitry	92	70	15
Port “K35”, angled	92	70	10
Port “K35”, straight	111	89	10

Type HED 8 OH… in vertical stacking NG10

1	Pressure switch HED 8 OH… for use in stacking assemblies (can be assembled staggered by 4 x 90°) The mounting option of the pressure switch depends on the set-up of the next stacking assembly subplate.
2	Sandwich plate type HSZ 10A... for use of the pressure switch as stacking element
3	Space required to remove the key
4	Space required to remove the mating connector

Mating connector	H1	H2	H3
Port “K14”, without circuitry	100	65	15
Port “K14”, with circuitry	105	70	15
Port “K35”, angled	105	70	10
Port “K35”, straight	124	89	10

Mating connectors for mechanical pressure switches with connector “K14”, without circuitry, standard

4P Z14